ADVERTISERS' PRODUCT GUIDE

ADVERTISERS' PRODUCT GUIDE

Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Tri R Instruments* W. M. Welch Manufacturing Co. Wilkens-Anderson Co.* Wil l Corp.

BEAKERS—see laboratory glassware, polyethylene ware

BELL JARS—see laboratory glassware, polyethylene ware

BITUMINOUS TESTING EQUIPMENT—see asphalt testing equipment

BLENDERS—see stirrers

14. BLOOD TESTING EQUIPMENT Aloe Scientific Division of A. S. Aloe Co.* American Hospital Supply Corp. American Instrument Co.* Bendix Aviation Corp.* C. A. Brinkmann & Co.* Burrell Corp. Chemical Rubber Co. Clay-Adams, Inc.* Doerr Glass Co.* Electric Hotpack Co.* Fisher Scientific Co.* Em il Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Microchemical Specialties* National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Scientific Industries, Inc.*

Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* Welwyn International, Inc. Wilkens-Anderson Co. Wil l Corp.

BOILER WATER TESTING EQUIPMENT— see water analysis equipment

15. BOILING POINT APPARATUS Chemical Rubber Co. Fisher Scientific Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

BOMB CALORIMETERS—see calorimeters

BOTTLES—see laboratory glassware, polyethylene ware

BRUSHES—see cleaning equipment

16. BURETS AND ACCESSORIES Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. C. A. Brinkmann & Co.* Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Doerr Glass Co.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific

Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Laboratory Equipment Corp.* Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Scientific Industries, Inc.* Standard Scientific Supply Co. Tenso-Lab, Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.*

17. BURNERS AND ACCESSORIES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co.* Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent 8. Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co.* Wilkens-Anderson Co. Will Corp.

18. CALORIMETERS AND ACCESSORIES, BOMB

Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co.

Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co.* Precision Scientific Co.* Prolabo* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co-Will Corp.

19. CALORIMETERS AND ACCESSORIES, GAS

Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Will Corp.

CAMERAS, PHOTOMICROGRAPHS—see photomicrographic cameras

CANS—see containers

CARBON DETERMINATORS—see combustion equipment

CARBOYS—see chemical handling equipment

20. CARTS, LABORATORY Aloe Scientific Division of A. S. Aloe Co.* American Hospital Supply Corp. Andrew Technical Supply Co.* S. Blickman Co.*

. . . for laboratory ware

in ALL plastics!

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Circle No. 36 A on Readers' Service Card

Direct Measurement of Difference in Refractive Index

The New Brice-Phoenix Differential

Refractometer uses a split cell to

measure the difference in refractive

index between a dilute solution and

its solvent.

Limiting sensitivity 3X1O^6.

PHOENIX PRECISION INSTRUMENT CO. 3805 N. 5th St. Phila. 40, Pa.


2 2 A · ANALYTICAL CHEMISTRY

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A major advance in weighing instrumentation combining a novel application of physical principles with modern engineering design, the Cahn Electrobalance is unaffected by vibration, or temperature change. You can use it anywhere, and depend on it. The beam balances in a few seconds

Espec ia l ly fast for we igh ing out predetermined amounts.

One-Knob, one-dial operation makes it excep t iona l ly easy to use .

Precise and Accurate It is really six balances in one.

Range Precision Accuracy 0-1 mg. 1 microgram 1.0 microgram 0-5 mg. 1 microgram 2.5 micrograms 0-10 mg. 2 micrograms 5.0 micrograms 0-20 mg. 5 micrograms 1 2.0 micrograms 0-50 mg. 8 micrograms 30.0 micrograms 0-100 mg. 25 micrograms 100.0 micrograms

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let us know if you would like a demonstration in your lab Circle No. 9 A on Readers' Service Card

Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Duralab Equipment Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Meinecke & Co., Inc. Metalab Equipment Corp.* New York Laboratory Supply Co. Nuclear Chicago Corp.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Cn. Wilkens-Anderson Co. Will Corp.

2 1 . CASSEROLES Aloe Scientific Divison of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coors Porcelain Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Divsion of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Palo Laboratory Supples, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

22. CATHETOMETERS Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Ealing Corp. Eberbach Corp.* Erb & Gray Scientific Inc. Fisher Scientific Co. Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. National Instruments Labs, Inc.* New York Laboratory Supply Co. E. H. Sargent & Co. Schaar & Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co.*

CELLS, ABSORPTION—see photometers & spectrophotometers

CELLS, CONDUCTIVITY—see conductivity equipment

23. CELLS, FLUORESCENCE Pyrocell Mfg. Co.*

24. CELLS, GAS ANALYSIS Pyrocell Mfg. Co.*

CELLS, OPTICAL—see photometers & spectrophotometers

CELLS, PHOTOFLUOROMETER—see fluo-rometers

CELLS, REFRACTOMETERS—see refrac-tometers

25. CELLS, UV & NEAR IR Pyrocell Mfg. Co.*

CEMENT TESTING EQUIPMENT—see soil testing equipment

26. CENTRIFUGES AND ACCESSORIES Aloe Scientific Division of A. S. Aloe Co.* American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Clay-Adams, Inc.* Cole-Parmer Instrument & Equipment Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific

Division of Harshaw Chemical Co. Instrumentation Associates International Equipment Co.* Labline, Inc.* Laboratory Equipment Co. Arthur S. LaPine & Co. Lourdes Instrument Corp.* Meinecke & Co., Inc. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Precision Scientific Co.* Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Sharpies Corp.* Ivan Sorvall, Inc.* Spinco* Division of Beckman Instruments Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co.* Will Corp.

27. CERAMIC WARE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Coors Porcelain Co.* Engelhard Industries* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Norton Co.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. U. S. Stoneware Co.* Wilkens-Anderson Co.

28. CHART BINDERS Spectra-Bind Associates

29. CHARTS, PERIODIC Aloe Scientific Division of A. S. Aloe Co. Chemical Rubber Co. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co.* Arthur S. LaPine & Co. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.*

30. CHEMICAL HANDLING EQUIPMENT Superior Air Products*

CHLORINE TESTING EQUIPMENT—see water testing equipment

31 . CHROMATOGRAPHY EQUIPMENT & ACCESSORIES, COLUMN

Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Instrument Co.* Atkins Technical, Inc. Barber-Colman Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Davis Instruments* Electric Hotpack Co.* Fischer & Porter Co.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co. Johns-Manville Corp.* Kontes Glass Co.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Loe Engineering Co.* Microchemical Specialties* New York Laboratory Supply Co. Packard Instrument Co., Inc.* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Podbielniak, Inc.* Research Specialties Co.* Rohm & Haas Co.* E. H. Sargent & Co. Schaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co.*



Ivan Sorvall, Inc. Spinco Division of Beckman Instruments Co.* Standard Scientific Supply Co. Arthur H. Thomas Co.* Will Corp.*

32. CHROMATOGRAPHY EQUIPMENT & ACCESSORIES, GAS

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atomic Accessories* Barber-Colman Co.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* Burrell Corp.* Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Davis Instruments* Electric Hotpack Co.* F & M Scientific Glassware Co.* Fisher Scientific Co.* Gow-Mac Instrument Co.* Emil Greiner Co. Hamilton Manufacturing Co.* Harshaw Scientific Division of Harshaw Chemical Co. Industrial Instruments, Inc.* Jarrell-Ash Co. Arthur S. LaPine & Co. Loe Engineering Co.* Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Podbielniak, Inc.* Precision Scientific Co.* Research Specialties Co.* Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Spectra-Bind Associates* Tenso-Lab, Inc. Arthur H. Thomas Co. Victory Engineering Co.* Volk Radiochemical Co. Wilkens-Anderson Co. Wilkens Instrument & Research Co. Will Corp.

33. CHROMATOGRAPHY EQUIPMENT & ACCESSORIES, PAPER

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw chemical Co. Labline, Inc.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Microchemical Specialties* National Appliance Co.* National Instrument Labs New Brunswick Scientific Co.* New York Laboratory Supply Co. Nuclear Chicago Corp.* Nuclear Measurements Corp.* Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Precision Scientific Co.* Research Specialties Co.* Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Carl Schleicher 8, Schuell Co.* Scientific Glass Apparatus Co. Ivan Sorvall, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Volk Radiochemical Co. W. M. Welch Manufacturing Co.* Wilkens-Anderson Co. Will Corp.

34. CHROMATOGRAPHY EQUIPMENT & ACCESSORIES, PROCESS CONTROL

American Hospital Supply Corp. Barber-Colman Co.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* Chemical Rubber Co. Consolidated Electrodynamics Corp.* Davis Instruments* Harshaw Scientific Division of Harshaw Chemical Co. Leeds & Northrup Co.* Loe Engineering Co.* Microchemical Specialties* Minneapolis-Honeywell Regulator Co.*

New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Phoenix Precision Instrument Co.* Podbielniak, Inc.* Preciaion Scientific Co.* Sadtler Research Laboratories Schaar & Co. Scientific Glass Apparatus Co. Victory Engineering Co.*

CHRONOGRAPHS—see timers

35. CLAMPS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co.* Meinecke & Co., Inc. Microchemical Specialties* Nester & Faust* New Brunswick Scientific Co.* New York Laboratory Supply Co.* Palo Laboratory Supplies, Inc. Prolabo* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co.* Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co.* Will Corp.

3G. CLEANING EQUIPMENT (see also ultrasonic cleaning equipment)

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Labline, Inc.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Palo Laboratory Supplies, Inc. Schaar & Co. Standard Scientific Supply Co. Wilkens-Anderson Co.

37. CLOTHING, LABORATORY Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.

38. COAL & COAL BY-PRODUCT TESTING APPARATUS AND ACCESSORIES

C. W. Brabender Instruments, Inc.* Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Parr Instrument Co.* Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Will Corp.

39. COLOR ANALYZERS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co.

LABORATORY HEEDS.. v ^ • Since 1931 New York Laboratory Supply Co., Inc., has been serving industry with al l their laboratory requirements. This has not been an easy job—it has been a challenge —a challenge we meet and conquer every day. Below is listed a few of the many instruments and apparatus we carry:

Balances & Weights

Baths

Calorimeters

Centrifuges & Accessories

Chemicals, Laboratory

Colorimeters

Crushers & Mills

Distilling Apparatus

Filter Papers

Furnaces

Gas Analysis Apparatus

Glassware

Heaters & Hotplates

Hydrogen-Ion Equipment

Hydrometers

Incubators

Metalographic Equipment

Microscopes & Accessories

Nitrogen Determination Equip.

Ovens

Petroleum Testing Equip.

Porcelain Ware

Powerstats

Pumps

Refractometers

Shakers

Sieves

Spectrophotometers

Stirrers—Mechanical & Magnetic

Thermometers, etc.

Let us help you efficiently so/ve your laboratory instrument and apparatus problems. Call on us, we will be glad to help you.

LABORATORY SUPPLIES NEW YORK Laboratory Supply

COMPANY, INC. 76 Varick Street , New York 13, Ν. Υ.

Telephone : CAnal 6 -6504


VOL. 3 1 , NO. 4, APRIL 1959 · 2 5 A

Supplying Your

Complete


Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Manufacturers Engineering & Equipment

Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. Wil l Corp.

40. COLORIMETERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* James G. Biddle Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates* Klett Manufacturing Co. Harold Kruger Co.* Arthur S. LaPine & Co. Laboratory Equipment Co. Manufacturers Engineering & Equipment

Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co. Phoenix Precision Instrument Co.* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Spinco* Beckman Instruments, Inc. Standard Scientific Supply Co. W. A. Taylor & Co., Inc.*

Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co.* Wilkens-Anderson Co. Wil l Corp.

COMBUSTION EQUIPMENT AND ACCESSORIES 4 1 . CARBON ANALYZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Chicago Apparatus Co. Harry W. Dietert Corp.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Lindberg Engineering Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Wilkens-Anderson Co. Will Corp.

42. FURNACES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Blue M Electric Co.* Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Despatch Oven Co.* Harry W. Dietert Co.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.

Gow-Mac Instrument Co.* Emil Greiner Co. Grieve-Hendry Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Kern Laboratory Supply Co. Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Lindberg Engineering Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Thermo Electric Manufacturing Co.* Arthur H. Thomas Co.* Victory Engineering Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

43. GAS ANALYZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Baird-Atomic, Inc.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* James G. Biddle Co. Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Davis Instruments* Engelhard Industries* Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Industrial Instruments, Inc.* Instrumentation Associates Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Leeds & Northrup Co.* Manufacturers Engineering & Equipment

Co.*

National Instrument Labs* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Victory Engineering Co.* Wilkens-Anderson Co. Wil l Corp.

44. HYDROCARBON ANALYZERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Central Scientific Co.* Chicago Apparatus Co. Davis Instruments* Electric Hotpack Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co.

45. HYDROGEN ANALYZERS Aloe Scientific Division of A. S. Alee Co. American Instrument Co.* Beckman Instruments, Inc. Scientific & Process Instruments Div." Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Chicago Apparatus Co. Davis Instruments* Engelhard Industries* Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific

^ Write for this free 40-page book HARSHAW SCINTILLATION PHOSPHORS Presents definitive article on characteristics and properties of scintillation phosphors with special emphasis on Nal(Tl). A general discussion of scintillation counting is augmented with many appropriate tables, efficiency curves, and typical gamma ray spectra. Gives specifications and drawings of Harshaw mounted phosphors, and lists miscellaneous other phosphors available from Harshaw. We will be pleased to send you a copy.

Also available . . . ψ Free 36-page book

HARSHAW SYNTHETIC OPTICAL CRYSTALS Discusses in detail various Harshaw crystals used for infra-red and ultra-violet optics. Includes many pertinent graphs. Ask for your copy today.

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Circle Nos. 49 A-1, 49 A-2 on Readers' Service Card



TOO MANY VARIABLES? IVs time to draw a line. Straighten out your cleaning problems with

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Write TODAY for Sample and Literature-Distributed by

MEINECKE & COMPANY, Inc. J 229 Varick Street · New York, 14


Division of Harshaw Chemical Co. Industrial Instruments, Inc.* Laboratory Equipment Corp." Arthur S. LaPine & Co. Leeds & Northrup Co.* New York Laboratory Supply Co. NRC Equipment Corp.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co.

46. OXYGEN ANALYZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Beckman Instruments, Inc. Scientific & Process Instruments Div.' Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Chicago Apparatus Co. Davis Instruments* Engelhard Industries* Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Industrial Instruments, Inc.* Instrumentation Associates Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Leeds & Northrup Co.* New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

47. SULFUR ANALYZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Burrell Corp.* Cambridge Instrument Co.* Chemical Rubber Co. Chicago Apparatus Co. Harry W. Dietert Co.* Erb & Gray Scientific, Inc. F & M Scientific Corp.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Lindberg Engineering Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, >nc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Wil l Corp.

COMPARATORS—see hydrogen ion apparatus

46. CONDENSERS AND ACCESSORIES Aloe Scientific Division of A. S. Aloe Co. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Microchemical Specialties* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.*

49. CONDUCTIVITY EQUIPMENT Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co.

Gow-Mac Instrument Co.* Emil Greiner Co. Industrial Instruments, Inc.* Laboratory Equipment Co. Arthur S. LaPine & Co. Leeds & Northrup Co.* LKB Produkter Fabriksaktiebolag* Loe Engineering Co.* Minneapolis-Honeywell Regulator Co.* Palo Laboratory Supplies, Inc. Sadtler Research Laboratories Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Ivan Sorvall, Inc. Tenso-Lab, Inc. Arthur H. Thomas Co.* Victory Engineering Co.* Welwyn International, Inc. Will Corp.

50. CONTAINERS AND CANS Atomic Accessories* George D. Ellis & Sons* Nalge Co.* Ε. Η. Sargent 8, Co. Schaar & Co.

51. COOLING DEVICES Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Andrew Technical Supply Corp.* Blue M Electric Co.* Chemical Rubber Co. Erb & Gray Scientific, Inc. Emil Greiner Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Presin Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus C». Superior Air Products* Will Corp.

52. COUNTING APPARATUS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Cora. Baird-Atomic, Inc.* Burrell Corp. Chicago Apparatus Co. Clay-Adams, Inc.* Fisher Scientific Co. Franklin Electronics Corp.* Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Microchemical Specialties* National Instruments Labs* New York Laboratory Supply Co. Nuclear Chicago Corp.* Presin Co.* Ε. Η. Sargent & Co.* August Sauter* Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Supply Standard Scientific Supply Co. Arthur H. Thomas Co. Volk Radiochemical Co.

53. COUNTER CURRENT DISTRIBUTION APPARATUS

E-C Apparatus Co.*

COUNTERS, RADIOACTIVITY—see radiation equipment

54. CRUCIBLES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. J. Bishop & Co. Platinum Works C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Coors Porcelain Co.* Corning Glass Works* Engelhand Industries* Fisher Scientific Co. Fish-Schurman Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Metals & Controls* National Carbon Co.* New York Laboratory Supply Co. Norton Co.* Oregon Metallurgical Corp.* Palo Laboratory Supplies, Inc. Parr Instruments Co.* Precision Scientific Co.* E. H. Sargent & Co.



Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Inc.* Arthur H. Thomas Co. United Carbon Products Co., Inc.* W. M. Welch Manufacturing Co. Will Corp.

55. CRUSHERS, GRINDERS, MILLS, PULVERIZERS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. W. Brabender Instruments, Inc.* Burred Corp. Chemical Rubber Co. Cole-Parmer Instrument & Equipment Co. Coors Porcelain Co.* Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Prolabo* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Ivan Somali, Inc. Spex Industries, Inc.* Arthur H. Thomas Co.* Torsion Balance Co.* U. S. Stoneware Co.* Wilkens-Anderson Co. Will Corp.

56. CRYSTALS, OPTICAL, IR, UV Isomat Corp.*

57. CYLINDERS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. Atkins Technical, Inc. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Doerr Glass Co.* Fisber Scientific Co. General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine 8, Co. Meinecke & Co., Inc. Microchemical Specialties* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

DEMINERALIZERS—see water purification equipment

58. DENSITOMETERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Applied Research Laboratories* Chemical Rubber Co. Erb & Gray Scientific, Inc. Fischer & Porter* Fisher Scientific Co. Emil Greiner Co. Jarrell-Ash Co.* Laboratory Equipment Co. Arthur s. LaPine & Co. Nuclear Chicago Corp.* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Photovolt Corp.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. W. M. Welch Manufacturing Co.*

DESALTERS—see chromatographic equipment

59. DESSICATORS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.

Chicago Apparatus Co. Corning Glass Works* Fisber Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

DETECTORS, GAS—see safety equipment —see radiation equipment

60. DIALYZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Fisher Scientific Co. Emil Greiner Co. Instrumentation Associates Kern Company Laboratory Glass & Instruments Corp.* Arthur S. LaPine & Co. Oxford Laboratories* Palo Laboratory Supplies, Inc. Schaar & Co. Carl Schleicher & Schuell Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc.

6 1 . DILATOMETER Instruments for Research & Industry*

62. DISHES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coors Porcelain Co.* Corning Glass Works* Fisber Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Kern Laboratory Supply Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co.* Meinecke & Co., Inc. Metals & Controls* Millipore Filter Corp.* Nalge Co.* Norton Co.* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wil l Corp.

63. DISTILLING APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument CO.* Andrew Technical Supply Corp.* Atkins Technical, Inc. Barnstead St i l l & Sterilizer Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Electric Hotpack Co.* Fish-Schurman Fisher Scientific Co." General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Labline, Inc.* Laboratory Equipment Co. Laboratory Glass & Instruments Corp.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Nester & Faust* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Patterson-Kelley Co.* Podbielniak, Inc.* Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co.

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TESTERS WATER BATHS PIPETTE

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VOL. 3 1 , NO. 4, APRIL 1959 · 2 9 A

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KLETT SCIENTIFIC PRODUCTS PHOTOELECTRIC COLORIMETERS · BIO-COLORIMETERS GLASS ABSORPTION CELLS · COLORIMETER NEPHELOM-ETERS · GLASS STANDARDS · KLETT REAGENTS

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Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

Inc.*

DOSIMETRY SERVICE—see radiation equipment

DRY ICE STORAGE CABINETS—see refrigeration equipment

64. DRYING APPARATUS & ACCESSORIES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* C. A. Brinkman & Co.* Burred Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Despatch Oven Co.* Fisher Scientific Co. Em il Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Kontes Glass Co.* Laboratory Equipment Co. Arthur S. LaPine & Co. National Appliance Co.* New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Teoso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

65. DUST SAMPLER American Instrument Co.* Arthur S. LaPine & Co.

66. EBULLIOMETERS Chemical Rubber Co. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Ε. Η. Sargent 8, Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

67. ELECTROLYTIC ANALYZER American Instrument Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Eberbach Corp.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientifc Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Leeds & Northrup Co.* Manufacturers Engineering & Equipment

Co.* Prolabo* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

ELECTRODES, pH—see hydrogen ion apparatus

ELECTROMETERS—see hydrogen ion apparatus

68. ELECTROLYSIS APPARATUS Atkins Technical, Inc. Chemical Rubber Co. Doerr Glass Co.* Eberbach Corp.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.*

69. ELECTROPHORESIS APPARATUS, PAPER—see also chromatography equipment

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkman & Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. E-C Apparatus Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Glass & Instruments Corp.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Research Specialties Co.* Ε. Η. Sargent 8. Co. Schaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Ivan Sorvall, Inc. Spinco* Division of Beckman Instruments, Inc. Standard Scientific Supply Co.* Wilkens-Anderson Co. Will Corp.

70. EVAPORATORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Chemical Rubber Co. Chicago Scientific Co. Cole-Parmer Instrument & Equipment Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Instrumentation Associates Labline, Inc.* Laboratory Glass i Instrument Corp.* Arthur s. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar 8. Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Stoneware Co.* Will Corp.

71. EXTRACTION APPARATUS 8, ACCESSORIES

Ace Glass, Inc.* Aloe Scientifc Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Corning Glass Works* E-C Apparatus Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Kontes Glass Co.* Labline, Inc.* Laboratory Construction Co. Arthur S. LaPine & Co. Microchemical Specialties* Norton Co.* Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Precisian Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

72. FILTERING EQUIPMENT Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. H. Reeves Angel & Co.* Barnstead Still & Sterilizer Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coors Porcelain Co.*

Klett Photometers

No. 900-3

No. 2070


Corning Glass Works* Fisher Scientific Co.* Em il Greiner Co. Hamilton Mfg. Co.* Harshaw Scientific Division of Harshaw Chemical Co. Johns-Manville Corp.* Arthur S. LaPine & Co.* Microchemical Specialties* Millipore Filter Corp.* New York Laboratory Supply Co.* Norton Co.* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co.* Standard Scientfic Supply Co. Tenso-Lab, Inc. U. S. Stoneware Co.* Wilkens-Anderson Co. Will Corp.

73. FILTERS, LIGHT & COLOR—see also radiation equipment

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Baird-Atomic, Inc.* Burrell Corp. Chicago Apparatus Co. Coleman Instruments Co., Inc.* Corning Glass Works* Eastman Kodak Co.* Harold Kruger Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precsion Instrument Co.* Photovolt Corp.* Scbaar & Co. Scientific Glass Apparatus Co. Carl Zeiss, Inc.

74. FIXTURES, LABORATORY SERVICE Alberene Stone Corp. Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Chemical Rubber Co. Duralab* Fisher Scientific Co. Emil Greiner Co. Arthur S. LaPine & Co. Metalab Equipment Corp.* Nalge Co.* Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc.

FLAME PHOTOMETERS—see photometers, fiame

75. FLASKS Ace Glass, Inc.* Aloe Scientific Division of A. s. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Doerr Glass Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Labline, Inc.* Arthur S. LaPine & Co, Meinecke & Co., Inc. Microchemical Specialties Co.* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Corp. Superior Air Products* Tenso-Lab, Inc. Thermal American Fused Ouartz Co., Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co.* Will Corp.

76. FLOW METERS AND ACCESSORIES American Instrument Co.* Brooks Rotameter* Burrell Corp. Chemical Rubber Co. Corning Glass Works* F & M Scientific Glassware Co.* Fischer & Porter* Fisher Scientific Co. General Laboratory Supply Co.

Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Arthur S. LaPine & Co. Minneapolis-Honeywell Regulator Co.* National Instrument Labs* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Podbielniak, Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.*

77. FLUOROMETERS, PHOTO, AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* James G. Biddle Co. Burrell Corp. Chemical Rubber Co. Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Farrand Optical Co., Inc.* Fisher Scientific Co.* Emil Greiner Co. Jarrell-Ash Co.* Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Pyrocell Manufacturing Co.* Schaar & Co. Scientific Glass Apparatus Co. Wilkens-Anderson Co. Will Corp.

78. FLUORESENCE METERS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Coleman Instruments Co., Inc.* Erb 8, Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Labline, Inc.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision instrument Co.* Photovolt Corp.* Schaar & Co. Scientific Glass Apparatus Co.

79. FORCEPS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Clay-Adams, Inc.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co., Inc. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wil l Corp.

80. FRACTION COLLECTORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp.* Chemical Rubber Co-Chicago Apparatus Co. Corning Glass Works* F & M Scientific Glassware Co. Fisher Scientific Co. Emil Greiner Co. Hamilton Manufacturing Co.* Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates Kontes Glass Co.*

Laboratory Glass & Instrument Corp.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Microchemical Specialties* New York Laboratory Supply Co. Packard Instrument Co., Inc.* Palo Laboratory Supplies, Inc. Research Specialties Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Ivan Sorvall, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.

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Tri-R Instruments* Wilkens-Anderson Co. Wil l Corp.

FREEZE DRYERS—see drying apparatus

81. FUNNELS, FILTER Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Fish-Schurman Fisher Scientific Co. General Laboratory Supply Co. Em il Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties* Millipore Filter Corp.* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Stoneware Co.* W. M. Welch Manufacturing Co. Will Corp.

82. FUNNELS, SEPARATORY Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Doerr Glass Co.*

Fischer & Porter Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Sepor Laboratory Supply* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

83. FURNACES—see also combustion equipment

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Andrew Technical Supply Co.* Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Consolidated Electrodynamics Corp.* Despatch Oven Co.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Grieve-Hendry Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Instruments for Research & Industry* Laboratory Equipment Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Lindberg Engineering Co.* NRC Equipment Corp.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & C o /

Schaar & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermo Electric Mfg. Co.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

FURNITURE, LABORATORY—see laboratory furniture

84. GALVANOMETERS American Hospital Supply Corp. American Instrument Co.* James G. Biddle Co. Cambridge Instruments Co.* Consolidated Electrodynamics Corp.* Ealing Corp. Fisher Scientific Co. Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Leeds & Northrup Co.* Minneapolis-Honeywell Regulator Co.* Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.* Welwyn International, Inc.

GAS ANALYSIS APPARATUS—see combustion equipment

85. GAS PURIFIERS Englehard Industries*

86. GENERATORS, GAS Atkins Technical, Inc. Burrell Corp. Fisher Scientific Co. Emil Greiner Co. Hevi-Duty Electric Co.* Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.*

U. S. Stoneware Co.* Will Corp.

GENERATORS, HIGH VOLTAGE—see power supplies

87. GAGES Ace Glass, inc.* American Instrument Co.* Andrew Technical Supply Corp.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Consolidated Electrodynamics Corp.* Fisher Scientific Co. General Electric Co.* X-Ray Department Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Kontes Glass Co.* LKB Produter Fabriksaktiebolog* Minneapolis-Honeywell Regulator Co.* National Instrument Labs* George F. Nelson Vacuum Pump Co. New York Laboratory Supply Co. NRC Equipment Corp.* Nuclear Corp. of America* Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co.* Victory Engineering Co.* W. M. Welch Manufacturing Co.*

GEIGER TUBES—see radiation equipment

GENERATORS, NEUTRON—see radiation equipment

88. GLASS ROD 8. WOOL Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co.

New- a low cost neutron generator

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Arthur S. LaPine & Co. Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instruments, Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

89. GLASS TUBING Ace Glass, Inc. Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Fischer & Porter* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp. Wilmad Glass Co.*

90. GLASS WORKING EQUIPMENT Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Fish-Schurman Fisher Scientific Co.* General Laboratory supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision instruments Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Will Corp.

91. GLASS JOINTS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Fischer & Porter* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties* Micro-Ware, Inc. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Podbielniah. Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp. Wilmad Glass Co.*

92. GLASSWARE, CUSTOM—see also laboratory glassware

Ace Glass, Inc.* American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc.* Chemical Rubber Co.* Corning Glass Works* Fischer 8, Porter* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co.

Kern Laboratory Supply Co. Kontes Glass Co.* Laboratory Equipment Corp.* Laboratory Glass & Instrument Corp.* Arthur S. LaPine & Co. Microchemical Specialties* Micro-Ware, Inc. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instruments Co.* Podbielniak, Inc.* Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. W. M. Welch Manufacturing Co. Wilkens-Anderson Co.* Will Corp.*

S3. GLOVE BOXES Aloe Scientific Division of A. S. Aloe Co. S. Blickman Co.* Duralab* Fisher Scientific Co.* Emil Greiner Co. Laboratory Equipment Co. Microchemical Specialties National Appliance Co.* NRC Equipment Corp.* Schaar & Co. Scientific Glass Apparatus Co. Torsion Balance Co.*

GLOVES—see safety equipment

GOGGLES—see safety equipment

GRADUATES—see cylinders

94. GRAPHITE PRODUCTS United Carbon Products Co., Inc.

95. GRATINGS—see also spectrographs Farrand Optical Co., Inc.*

GRINDERS—see crushers

96. GRINDING MACHINES AND WHEELS Norton Co.*

97. HARDNESS TESTERS Torsion Balance Co.*

98. HEATERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Briscoe Manufacturing Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Duralab* Eberbach Corp.* Electric Hotpack Co. Engelhard Industries* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co. Lindberg Engineering Co.* Meinecke 8, Co., Inc. National Carbon Co. Division of Union Carbide Corp. New York Laboratory Supply Co. Norton Co.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar 8. Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Inc.' Thermo Electric Manufacturing Co.* Arthur H. Thomas Co. Tri-R Instruments* United Carbon Products Co., Inc.* W. M. Welch Manufacturing Co. Wesco Electric Co.* Wilkens-Anderson Co.

99. HEATING MANTLES Ace Glass, Inc. Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Briscoe Manufacturing Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Electric Hotpack Co.

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of temperature. All models have stainless steel cases and are scientifically ventilated. TYPE 1900

TEMCO STIR-PLATE

This popular combination magnetic stirrer and hot plate provides a wide range of closely controlled temperature and stirring speed.

TEMCO FLASK HEATER

One unit with interchangeable baskets handles several flask sizes. Rugged, safe, dependable.

TEMCO PORTABLE PYROMETER

For accurate and convenient measurement of temperature and direct-current millivolts.

Choose TEMCO products with confidence. Many thousands are in use the world over. Write for free TEMCO-TIIERMOLYNE catalog information and name of nearest dealer.

THERMO ELECTRIC MFG. CO., 478 Huff St., Dubuque, Iowa Circle Nos. 32 A-1, 32 A-2, 32 A-3, 32 A-4, 32 A-5, 32 A-6 on Readers' Service Card

VOL. 3 1 , N O . 4 , APRIL 1959 · 3 3 A

CENTRIFUGES A N D

LABORATORY

INSTRUMENTS

"RC-2" AUTOMATIC REFRIGERATED SUPERSPEEO CENTRIFUGE*

The latest and greatest advance in automated, low-temperature cen-trifugation—designed specifically to meet the practical requirements of the researcher.

AUTOMATIC PUSHBUTTON

SUPERSPEEO CENTRIFUGE*

The first table-top instrument to provide true automation—an indispensable centrifuge where personnel shortage is a problem.

ENCLOSED SUPERSPEEO CENTRIFUGE*

Offers performance equal to the above instruments, but has been designed for those who prefer manual control.

CONTINUOUS FLOW SYSTEM*

Sedimentation where the researcher wants it—directly in tubes. Small amounts of sediment may be collected from large reservoirs of material. 8, 4, 2 tubes, or only 1 tube may be employed.

Rotors: Superspeed, Angle, Horizontal,* Particle Counting, Large Capacity, etc., suited to most laboratory tasks—others under development. Other SERVALL Instruments: Small & Medium Angle Centrifuges, "Porter-Blum" Ultra-Microtome, * High-Speed Homogen-izer, Cabinets, Tubes and 'Accesso-

LKB Instruments: Electrophoresis, Chromatography including the ChroMax Pressurized Paper Column System, MiniFlow Pump.

* Paf. * Pal. Pending.

Write for General Catalog: ACR-59G

I V A N S O R V A L L , I N C . NORWALK CONNECTICUT An independent company; not connected with any other centrifuge manufacturer. Established 1934.



Erb & Gray Scientific, Inc. F&M Scientific Glassware Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Kern Laboratory Supply Co. Kontes Glass Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Prolabo* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

100. H0M0GENIZERS

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkman & Co.* Brownwill Scientific Div. of Will Corp. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Lourdes Instrument Corp.* Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Ivan Sorvall, Inc.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Tri-R Instruments* Wilkens-Anderson Co. Will Corp.

101. HOODS & ACCESSORIES

Alberene Stone Corp.* Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. American Instrument Co.* S. Blickman Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Duralab* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Laboratory Equipment Co. . Arthur S. LaPine & Co. Metalab Equipment Co. New Brunswick Scientific Co.* Palo Laboratory Supplies, Inc. Schaar & Co. Standard Scientific Supply Co. Will Corp.

HOT PLATES—see heaters

102. HUMIDITY CABINETS

Ace Glass, Inc. American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* Atkins Technical, Inc. Blue M Electric Co.* Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Wilkens-Anderson Co. Will Corp.

103. HUMIDITY INDICATORS Science Markets

HYDROGEN ANALYZERS—see combustion equipment

HYDROGEN ION APPARATUS

104. ELECTRODES

105. ELECTROMETERS

Applied Physics Corp.

106. pH COMPARATORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Analytical Measurements* Beckman Instruments, Inc. Scientific & Process Instruments Div.* C. A. Brinkman & Co.

Burrell Corp. Cambridge Instruments Co.* Chemical Rubber Co.* Chicago Apparatus Co. Coleman Instruments Co., Inc.* Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Co. LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Photovolt Corp.* E. H. Sargent & Co. Schaar & Co. Scientific Industries, Inc.* Scientific Glass Apparatus Co. Standard Scientific Supply Co. W. A. Taylor & Co., Inc.* Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co.* Welwyn International, Inc. Wilkens-Anderson Co. Will Corp.

107. POTENTIOMETERS

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Analytical Measurements* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Coleman Instruments Co., Inc.* Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Instrumentation Associates Harold Kruger Co.* Arthur S. LaPine & Co. Leeds & Northrup Co.* Minneapolis-Honeywell Regulator Co.* Palo Laboratory Supplies, Inc. Photovolt Corp.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Welwyn International, Inc. Wilkens-Anderson Co.* Will Corp.

108. HYDROGENATION APPARATUS American Hospital Supply Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Emil Greiner Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. parr Instrument Co.* E. H. Sargent & Co. Schaar 8. Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

109. HYDROMETERS Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Beckman Instruments, Inc. Scientific & Process Instruments Div.' Burrell Corp. Cambridge Instruments Co.* Chemical Rubber Co.* Chicago Apparatus Co.



Doerr Glass Co.* Fischer & Porter* Fisher Scientific Co. General Laboratory Supply Co. Em il Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lah, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

110. HYGROMETERS American Instrument Co.* Atkins Techncial, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Fischer & Porter* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co. Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

111. INCUBATORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* Atkins Technical, Inc. S. Blickman Co.* Blue M Electric Co.* C. A. Brinkman & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Laboratory Equipment Co. Arthur s. LaPine & Co. Meinecke & Co., Inc. Millipore Filter Corp.* National Appliance Co.* New Brunswick Scientific Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

112. JARS Aloe Scientific Division of A. s. Aloe Co. American Agile Corp.* American Hospital Supply Corp. Atkins Technical, Inc. Bel-Art Products* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Coors Porcelain Co.* Corning Glass Works* Doerr Glass Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Meinecke & Co., Inc. Microchemical Specialties Nalge Co.* New York Laboratory Supply Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.*

Schaar & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Arthur H. Thomas Co. U. S. Stoneware Co.* Will Corp.

JOINTS, GLASS—see glass joints

113. KETTLES, REACTION Aloe Scientific Division of A. S. Aloe Co. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Kontes Glass Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Patterson-Kelly Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Stoneware Co.* Will Corp.

KJELDAHL APPARATUS—see nitrogen determination apparatus

114. LABORATORY FURNITURE & FURNISHINGS

Alberene Stone Corp.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. S. Blickman Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Duralab* Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co. Graphic Systems Emil Greiner Co. Labline, Inc.* Laboratory Construction Co. Laboratory Equipment Co. Laboratory Furniture Co. Arthur S. LaPine 8, Co. Meinecke & Co., Inc. Metalab Equipment Corp.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

115. LABORATORY GLASSWARE AND PLASTICWARE AND CERAMICWARE

Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Bel-Art Products* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Clay-Adams, Inc.* Corning Glass Works* Doerr Glass Co.* Engelhard Industries* Fischer & Porter* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Micro-Ware, Inc. Millipore Filter Corp.* Nalge Co.* New York Laboratory Supply Co. Norton Co.* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.*

*Patents Pending

SCIENTIF IC & INDUSTRIAL

MECHANICAL CONVECTION OVENS

BLUE M's Elect rlc Ovens now use Maximum wattage ONLY on initial run-up. When set temperature is r e a c h e d , POWER-O-MATIC goes into action and MIN IMUM wattage is AUTOMATICALLY modulated in relation to temperature and work load.

S T R A I G H T L INE T E M P E R A T U R E C O N T R O L A U T O M A T I C H E A T R E C O V E R Y

E X T R A " 4 0 0 % " SAFETY F A C T O R H O R I Z O N T A L A I R F L O W

^ T E M P E R A T U R E R A N G E : TO 3 1 6 ° <

Model No.

1. w.

5. (Inch D.

es) H.

Max. Watts

Voltage 50/60 Cycles

Complete Price

POM-100 14 14 14 2800 115 Volts $625.00 POM-110 20 18 20 4000 230V/1 ph. 749.00 POM-120 25 20 20 4400 230V/1 ph. 875.00 POM-130 38 20 25 5800 230V/1 ph. 1,120.00 POM-140 48 24 36 8500 230V/I ph. 1,775.00

ALSO AVAILABLE IN BENCH AND LARGE INDUSTRIAL MODELS WRITE FOR -THE POWER-O-MATIC STORY"

BLUE M ELECTRIC CO. BLUE ISLAND. ILL.

MANUFACTURERS AND DESIGNERS OF COMPLETE TEMPERATURE CONTROLLED EQUIPMENT

VOL. 3 1 , NO. 4, APRIL 1959 · 3 5 A

MiHJ:-reTÎTre niTW-HÎHrM.VJ:-^!

G-uaianXetcL,

HEART OF CONTROL

A PROVEN DESIGN k Multiple β \ "fail-Safe" J?

^V. Feature ^-"


116. LABORATORY ROOMS Aloe Scientific* Division of A. S. Aloe Co. American Hospital Supply Corp. Andrew Technical Supply Co.* Chemical Rubber Co.* Cole-Parmer Instrument 8, Equipment Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. General Laboratory Supply Co. Emil Greiner Co. Labline, Inc.* Laboratory Equipment Co. Palo Laboratory Supplies, Inc. Sadtler Research Laboratories Schaar & Co. Wilkens-Anderson Co. Will Corp.

LABORATORY SERVICE FIXTURES—see fixtures, laboratory

LABORATORY SERVICES—see services, analytical

LADDERS—see safety equipment

118. LAMPS, INFRARED Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Engelhard Industries* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co., Inc. New York Laboratory Supply Co.

119. LAMPS, SODIUM & POTASSIUM ARC Aloe Scientific Division of A. S. Aloe Co. Chemical Rubber Co.* Chicago Apparatus Co. Fisher Scientific Co. George W. Gates & Co., Inc.* General Laboratory Supply Co. Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* 0 . C. Rudolph & Sons, Inc. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co.

120. LAMPS, ULTRAVIOLET Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Engelhard Industries* Erb & Gray Scientific, Inc. Fisher Scientific Co. George W. Gates Co., Inc.* General Laboratory Supply Co. Emil Greiner Co. Jarrell-Ash Co.* Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Research Specialties Co.* 0 . C. Rudolph & Sons, Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wil l Corp.

121. LENSES Kollmorgen Optical Co.

LIGHT SOURCES—see lamps

122. MAGNETS Sepor Laboratory Supply*

MANOMETERS—see gauges

123. MARKERS American Hospital Supply Co. Blaisdell Pencil Co. Burrell Corp. Coors Porcelain Co.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Nuclear Chicago Corp. Oxford Laboratories*

Palo Laboratory Supplies, Inc. E. H. Sargent 8, Co. Schaar & Co-Scientific Glass Apparatus Co.

124. MELTING POINT APPARATUS AND ACCESSORIES

Ace Glass, Inc.* American Hospital Supply Corp. American Instrument Co.* C. A. Brinkmann 8. Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb 8, Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. William J. Hacker & Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instruments Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* Wilkens-Anderson Co. Will Corp.

125. MERCURY CLEANING EQUIPMENT

Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Eberbach Corp.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Wilkens-Anderson Co. Will Corp.

126. METALLURGICAL APPARATUS

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* C. A. Brinkmann & Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Thermo Electric Manufacturing Co.* United Carbon Co.* Wilkens-Anderson Co. Wil l Corp.

127. METALLOGRAPHIC EQUIPMENT

Aloe Scientific Division of A. S. Aloe Co. C. A. Brinkmann & Co. Burrell Corp. Chemical Rubber Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. William J. Hacker & Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Tenso-Lab, Inc. Unitron Instrument Division of United Scientific Co.* Will Corp.

128. MICROSCOPES, ELECTRON AND ACCESSORIES

Bendix Aviation Corp. Chemical Rubber Co.* Erb 8. Gray Scientific, Inc. Fisher Scientific Co. General Electric Co.* Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. National Instrument Labs* Philips Electronics, Inc.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Carl Zeiss, Inc.

129. MICROSCOPES, OPTICAL AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* American Optical Co.* Bausch & Lomb Optical Co.* C. A. Brinkmann & Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Ealing orp. Erb 8. Gray Scientific, Inc.* Farrand Optical Co., Inc.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. William J. Hacker 8, Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine 8, Co. Meinecke 8, Co., Inc. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Ε. Η. Sargent 8, Co. Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Supply Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Unitron Instrument Division of United Scientific Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp. Carl Zeiss, Inc.

130. MICROTOMES AND ACCESSORIES Aloe Scientific Division of A. S. Aloe Co.* Amercian Hospital Supply Corp. C. A. Brinkmann & Co.* Burrell Corp. Cambridge Instrument Co.* Chemical Rubber Co.* Chicago Apparatus Co. Erb 8, Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. William J. Hacker & Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates International Equipment Co.* Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine 8, Co. LKB Produkter Fabriksaktiebolag* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Research Specialties Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Ivan Sorvall, Inc.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

131. MILK TESTING APPARATUS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* C. W. Brabender Instruments, Inc.* Burrell Corp. Chemical Rubber Co.* Doerr Glass Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Merck & Co.* Millipore Filter Corp.* National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc.

Phoenix Precision Instruments Co.* E. H. Sargent & Co. Schaar & Co. Carl Schleicher 8, Schuell Co.* Scientific Glass Apparatus Co.* Sepor Laboratory Supply Tenso-Lab. Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.*

MILLS—see crushers

MIXERS—see stirrers

132. MODELS, ATOMIC, MOLECULAR, CRYSTAL

Aloe Scientific Division of A. S. Aloe Co. Central Scientific Co.* Chicago Apparatus Co. Ealing Corp. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine 8, Co. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Will Corp.

133. MOISTURE DETERMINATION APPARATUS

Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Beckman Instruments, Inc. Scientific & Process Instruments Div.* C. W. Brabender Instruments, Inc.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Consolidated Electrodynamics Corp.* Harry W. Dietert Corp.* Electric Hotpack Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Labline, Inc.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Manufacturers Engineering & Equipment

Co.* Minneapolis-Honeywell Regulator Co.* National Appliance Co.* New York Laboratory Supply Co. Nuclear Chicago Corp.* Ohaus Scale Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* August Sauter* Schaar & Co. Scientific Glass Apparatus Co.* Ivan Sorvall, Inc. Standard Scientific Supply Co. Arthur H. Thomas Co. Weighing and Control Components, Inc.* Will Corp.

134. MOLECULAR WEIGHT APPARATUS American Instrument Co.* Bendix Aviation Corp.* C. W. Brabender Instruments, Inc.* Burrell Corp. Chemical Rubber Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Arthur S. LaPine 8, Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar 8, Co. Scientific Glass Apparatus Co.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.*

MONITORS, RADIOACTIVITY—see radiation equipment

135. MONOCHROMATORS American Hospital Supply Corp. American Instrument Co.* Applied Research Labs* James G. Biddle Co. C. A. Brinkmann & Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb 8> Gray Scientific, Inc. Farrand Optical Co., Inc.* Fisher Scientific Co. Emil Greiner Co.

3 6 A · ANALYTICAL CHEMISTRY Circle No. 27 A on Readers' Service Card

SCIENTIFIC INDUSTRIES

ULTRA-BURET

A NEW INSTRUMENT THAT GIVES YOU . . . • PRECISE CONTROL OVER ULTRA-

MICRO QUANTITIES — Markings to .001 ml.; can be read to .0001 ml.

• HIGH CAPACITY—up to 7 ml. without refilling. Ultra-micro and macro.

• EASY READING ON CALIBRATED WHEEL — No meniscus; simple reset to zero to start each titration.

• INSTANT SPEED ADJUSTMENT— Perfect control without use of valves or stopcocks. Just turn the wheel.

Take Advantage of our 30 Day Test in your Laboratory

Ask your Laboratory Supply Dealer for particulars . . . or write for Descriptive Bulletin!

SCIENTIFIC INDUSTRIES, INC. 13 Park Street Springfield 3, Mast.


ORGANIC REAGENTS

Dithiol (Toluene-3,4-Dithiol) Diacetyl-, Dibenzoyl- and Zinc-Dithiol

Benzyl Trimethyl Ammonium Hydroxide (40% Aqu. Sol.)

/3-Naphthoquinoline - Imidazole Triphenyl Phosphine

Glycerol-l,3-Dichlorohydrin Dimethylglyoxime & Sodium Salt

2,4-Dinitrophenylhydrazine Malonic Acid, Reagent

Phenazine & Phenazine Methosulfate Digitonin * lodoacetic Acid

Murexide · Ninhydrin Orcinol Phloroglucinol

EASTERN C H E M I C A L

34-K SPRING STREET C O R P O R A T I O N

NEWARK 4, N. J.


Circle No. 88 λ on Readers' Service Card


Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Nuclear Corp. of America* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Photovolt Corp.* 0. C. Rudolph & Sons, Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Will Corp.

136. MORTARS AND PESTLES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Coors Porcelain Co.* Harry W. Dietert Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties New York Laboratory Supply Co. Norton Co.* Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

137. NEPHELOMETERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkman & Co. Burrell Corp. Chemical Rubber Co.* Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Arthur S. LaPine & Co. Phoenix Precision Instrument Co. Photovolt Corp.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

NEUTRON SOURCES—see radiation equipment

138. NITROGEN DETERMINATION APPARATUS

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Construction Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Texas Nuclear Corp.* Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

139. NITROMETER Chemical Rubber Co.* Fisher scientific Co.

General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Schlumberger Well Surveying Corp.* Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co.

OHMETERS—see ammeters

140. OSCILLOSCOPES Allied Radio Corp.* American Instrument Co.* Baird-Atomic, Inc.* Cambridge Instrument Co.* Central Scientific Co.* Fisher Scientific Co. Radio Corp. of America* Southern Instruments, Ltd.* W. M. Welch Manufacturing Co. Welwyn International, Inc.

141. OVENS—see also combustion equipment

Ace Glass, Inc. Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Blue M Electric Co.* C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Despatch Oven Co.* Harry W. Dietert Co.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Grieve-Hendry Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Hevi-Duty Electric Co.* Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

OXYGEN ANALYZERS—see combustion equipment

OXYGEN BOMBS—see calorimeters

142. PAINT TESTING APPARATUS American Hospital Supply Corp. American Instrument Co.* C. W. Brabender Instruments, Inc.* Burrell Corp.* Chemical Rubber Co.* Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc.

143. PARTICLE SIZE APPARATUS American Hospital Supply Corp. American Instrument Co.* C. A. Brinkmann & Co.* Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Harshaw Scientific Divsion of Harshaw Chemical Co. Arthur S. LaPine & Co. Millipore Filter Corp.* Palo Laboratory Supplies, Inc.* Phoenix Precision Instrument Co.* Prolabo* Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Supply* Sharpies Corp.*


PENCILS—see markers

PENETROMETERS—see asphalt testing equipment & petroleum testing equipment

PEROXIDE BOMBS—see calorimeters

PETROLEUM TESTING EQUIPMENT

144. ANILINE POINT APPARATUS Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

145. BATHS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Blue M Electric Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co.

Labline, Inc.* Arthur S. LaPine & Co. National Appliance Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co.* Will Corp.

146. BOMB SAMPLER Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

147. CARBON RESIDUE APPARATUS Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc.

Precision Scientific Co.* Sadtler Research Laboratories E. H. Sargent & Co. Schaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Will Corp.

148. CHROMOMETER Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co.

149. CLOUD AND POUR POINT APPARATUS

Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.*

E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

150. COLORIMETER Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Beckman Instruments, Inc. Scientific & Process Instruments Div. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

151. CORROSION TEST APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co.

GLASS ABSORPTION CELLS OF FINE QUALITY

KLETT

Klett-Summerson Photoelectric Colorimeters -Colorimeters - Nephelometers - Fluorimeters Bio-Colorimeters - Comparators - Glass Stand

ards - Glass Cell - Klett Reagents KLETT M A N U F A C T U R I N G C O . 1 7 7 E A S T 8 7 T H S T R E E T N E W Y O R K Ν . Υ .



MADE BY


Kern Laboratory Supply Co. Labline, Inc.* Arthur S. Lapine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

152. DISTILLATION APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Corning Glass Works* Engelhard Industries* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Labline, Inc.* Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Podijielniak, Inc.* Precision Scientific Co.* Ε. Η. Sargent & Co.* Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

153. FLASH POINT TESTER Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

154. GREASE WORKING » TESTING APPARATUS

Aloe Scientific Division of A. S. Aloe Co. C. W. Brabender Instrument, Inc.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

155. GUM CONTENT APPARATUS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.

:Emil Greiner Co.

Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Will Corp.

156. HALOGEN DETERMINATION APPARATUS

Aloe Scientific Division of A. S. Aloe Co. C. A. Brinkmann & Co.* Burrell Corp. Chemical Rubber Co.* Erb & Gray Scientific, Inc. F & M Scientific Glassware Co.* Fisher Scientific Co. Emil Griener Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies. Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

157. MELTING POINT APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Engelhard Industries* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Microchemical Specialties* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co.

158. OXIDATION APPARATUS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc. Laboratory Equipment Corp.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co.

159. PENETROMETERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co.* Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.*

What Is Your Interest? POLAROGRAPHY?

We offer a wide selection of polarographic reagents, particularly quaternary ammonium compounds, very highly purified especially for polarographic use. Let us send you a complete list.

NON-AQUEOUS TITRATIONS? The very best reagent for potentiometric titrations

of acids is Tetra-n-butylammonium Hydroxide. We supply it as a solution in methanol or in water. We will gladly send you more information.

DETERMINATION OF ORGANIC HALOGENS?

We package a ready-to-use solution of sodium bi-phenyl which will quickly and easily convert organically combined chlorine, bromine, or iodine to titratable ionic form. Traces or large amounts of halogens in even the most refractory molecules can be decomposed without the use of expensive, time-consuming bomb or combustion apparatus. May we send you more information on our ORGANIC HALOGEN REAGENT?

For literature on any of these items circle Nos. 62A-1, 62A-2, 62A-3 on the Readers' Service Card, or address inquiries directly to us.

SOUTHWESTERN ANALYTICAL CHEMICALS

P. O. Box 485, Austin 63, Texas Tel. GR 6-9379

MEASURE MOLECULAR WEIGHT AND PARTICLE SIZE

NEW BRICE-PHOENIX UNIVERSAL LIGHT SCATTERING PHOTOMETER

M e a s u r e s : 1. Absolute Turbidity 2. Dissymmetry 3. Depolarization

This instrument is listed in U.S. Government specifications for the evaluation of certain clinical materials.

PHOENIX PRECISION INSTRUMENT COMPANY 3805 N . 5th St. Philadelphia 4 0 , Pa.


VOL. 31 , NO. 4, APRIL 1959 · 4 1 A


Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

160. SULFUR DETERMINING APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Harry W. Dietert Co.* Erb & Gray Scientific, Inc. F & M Scientific Glassware Co.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Lindnerg Engineering Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co.* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

161. TETRAETHYLLEAD APPARATUS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Wilkins-Anderson Co. Will Corp.

162. VAPOR PRESSURE APPARATUS Aloe Scientific Division of A. S. Aloe Co. Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Larjline. inc.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

163. VISCOMETERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Bendix Aviation Corp.* C. W. Brabender Instruments, Inc.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Fish-Schurman*

Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Polarad Electronics Corp.* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc. Arthur H. Thomas Co.* U. S. Testing Co. Wilkens-Anderson Co.

164. VISCOSIMETERS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* C. W. Brabender Instruments, Inc.' C. A. Brinkmann & Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fischer & Porter Co.* Fisher Scientific Co.* Fish-Schurman* Emil Greiner Co. William J. Hacker & Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Polarad Electronics Corp.* Precision Scientific Co.* Ruska Instrument Corp.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* U. S. Testing Co. Wilkens-Anderson Co. Wil l Corp.

165. VISCOSITY BATHS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Blue M Electric Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Labline, Inc.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. U. S. Testing Co. Wilkens-Anderson Co.* Will Corp.

pH METERS—see hydrogen ion apparatus

PHOSPHATE TESTING EQUIPMENT—see water testing equipment

166. PHOTOCHEMICAL REACTOR EQUIPMENT

Engelhard Industries* Arthur S. LaPine & Co. Phoenix Precision Instrument Co.* Scientific Glass Apparatus Co.

PHOTOFLUOROMETERS—see fluorometers

167. PHOTOMETERS—(see also colorimeters)

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Beckman Instruments, Inc. Scientific & Process instruments Div.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Coleman Instrument Co., Inc.* Eldorado Electronics* Erb & Gray Scientific, Inc. Farrand Optical Co., Inc.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co.

LKB Produkter Fabriksaktiebolag* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Photovolt Corp.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. W. M. Welch Manufacturing Co.* Wilkens-Anderson Co. Will Corp.

168. PHOTOMETERS, FLAME Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Baird-Atomic, Inc.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* James G. Biddle Co. C. A. Brinkmann & Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coleman Instrument Co., Inc.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates National Instrument Labs* Perkin-Elmer Phoenix Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Wilkens-Anderson Co. Wil l Corp.

169. PHOTOGRAPHIC EQUIPMENT American Instrument Co.* Applied Research Labs* Eastman Kodak Co.* F & M Scientific Glassware Co. Arthur S. LaPine & Co. Schaar & Co. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.* Carl Zeiss, Inc.

170. PHOTOMICROGRAPHS CAMERAS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. C. A. Brinkman & Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Eastman Kodak Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Fish-Schurman* Emil Greiner Co. William J. Hacker & Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp. Carl Zeiss, Inc.

171. PHOTOSENSITIVE DEVICES American Instrument Co.* Eastman Kodak Co.* Erb & Gray Scientific, Inc. Arthur S. LaPine & Co. New York Laboratory Supply Co. Phoenix Precision Instruments Co.* Ε. Η. Sargent & Co.* Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.*

172. PILOT PLANT EOU1PMENT C. 0 . Bartlett & Snow Co.

173. PIPE & TUBING American Agile Corp.* American Instrument Co.* Barnstead Still & Sterilizer Co.* Bel-Art Products* . . Bishop & Co. Platinum Works* iorning Glass Works* tngelhaid Industries* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Metals & Controls* Microchemical Specialties Nalge Co.* Oregon Metallurgical Corp.* Palo Laboratory Supplies, Inc.

Phoenix Precision Instrument Co.* Schaar & Co. Scientific Glass Apparatus Co. Thermal American Fused Quartz Co., Inc.* U. S\ Stoneware Co.*

174. PIPETS t ACCESSORIES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Atomic Accessories Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Clay-Adams, Inc.* Corning Glass Works* George D. Ellis & Sons Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Hamilton Manufacturing Co.* Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates Kontes Glass Co.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Ivan Sorvall Co.* Standard Scientific Supply Co. Tenso-Lab, Inc.* Arthur H. Thomas Co. Volk Radiochemical Co. W. M. Welch Manufacturing Co. Will Corp.* PLASTICWARE—see laboratory glassware

and plasticware

175. PLATES Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* Chemical Rubber Co. Coors Porcelain Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Norton Co. Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co.* Tenso-Lab, Inc.

PLATINUM WARE—see precious metal-ware

176. POLARIMETERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* C. A. Brinkman 8> Co. Burrell Corp. Chemical Rubber Co. Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Photovolt Corp.* 0 . C. Rudolph* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

177. POLAROGRAPHS & ACCESSORIES C. A. Brinkman & Co.* Chemical Rubber Co. Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Instrumentation Associates Arthur S. LaPine & Co. Leeds & Northrup Co.* LKB Produkter Fabriksaktiebolag* New York Laboratory Supply Co. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Southern Instruments, Ltd.* Standard Scientific Supply Co. Arthur H. Thomas Co. Welwyn International, Inc. Will Corp.



178. POLYETHYLENE WARE Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Agile Corp.* American Hospital Supply Corp. Bel-Art Products* Burred Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co. Microchemical Specialties Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

179. PORCELAIN WARE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Microchemical Specialties Palo Laboratory Supplies, Inc. E. H. Sargent g, Co. Schaar g Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Stoneware Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

180. POROSIMETERS American Instrument Co.* Chemical Rubber Co. Emil Greiner Co. Arthur S. LaPine & Co.

POTENTIOMETERS—see hydrogen ion apparatus

181. POWER SUPPLIES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Baird-Atomic, Inc.* Chemical Rubber Co. Chicago Apparatus Co. E-C Apparatus Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Gow-Mac Instrument Co.* Emil Greiner Co. Hevi-Duty Electric Co.* Laboratory Glass g Instrument Corp.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Microchemical Specialties* Nuclear Electronics Corp.* Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Research Specialties Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Technical Measurements Corp.* Arthur H. Thomas Co.* W. M. Welch Manufacturing Co.*

182. PRECIOUS METALWARE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Co. 1. Bishop & Co. Platinum Works* Chemical Rubber Co. Engelhard Industries* Fisher Scientific Co-General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Metals & Controls* New York Laboratory Supply Co.

Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

183. PRESSES, LABORATORY Aloe Scientific Division of A. S. Aloe Andrew Technical Supply Corp.* Burrell Corp. Fred J. Carver, Inc. Chemical Rubber Co. Chicago Apparatus Co. Harry W. Dietert Corp.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Loomis Engineering & Manufacturing Co.* Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

184. PRESSURE DEVICES Nuclear Corp. of America*

185. PROJECTORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Ealing Corp. Eastman Kodak Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Schaar & Co. W. M. Welch Manufacturing Co.

PROPORTIONAL COUNTERS—see radiation equipment

PULVERIZERS—see crushers

186. PUBLICATIONS, TECHNICAL (not free)

Allied Radio Corp. American Instrument Co.* Sadtler Research Laboratories Ε. Η. Sargent & Co.* Scientific Glass Apparatus Co. Spex Industries, Inc.* John Wiley 8. Sons, Inc.

187. PUMPS, AIR, LIQUID, PRESSURE, VACUUM AND ACCESSORIES—see also chemical handling equipment

Aloe Scientific* Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Barnstead Still & Sterilizer Co.* Bel-Art Products* Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment

Co.* Consolidated Electrodynamics Corp.* Eastern Industries, Inc. E-C Apparatus Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates Kontes Glass Co.* Harold Kruger Co.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* George F. Nelson Vacuum Pump Co.* New Brunswick Scientific Co.* New York Laboratory Supply Co. NRC Equipment Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ruska Instrument Corp.* Ε. Η. Sargent & Co.*

Schaar & Co. Scientific Glass Apparatus Co. Sigmamotor, Inc.* Standard Scientific Supply Co. Superior Air Products* Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co.* Wilkens-Anderson Co. Will Corp.

188. QUARTZ Englehard Industries*

RADIATION EQUIPMENT 189. ACCELERATORS, NEUTRON SOURCE High Voltage Engineering Corp.

190. ACCELERATORS, PARTICLE High Voltage Engineering Corp.

191. AMPLIFIERS Anton Electronic Laboratories, Inc.* Baird-Atomic, Inc.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* Eldorado Electronics* Franklin Electronics Corp.* Minneapolis-Honeywell Regulator Co.* Nuclear Corp. of America* Nuclear Electronics Corp.* Packard Instruments Co., Inc.* Philips Electronics, Inc.* Technical Associates* Tracerlab, Inc.

192. CALIBRATORS Anton Electronic Laboratories, Inc.* Atomic Accessories Baird-Atomic, Inc.* Franklin Electronics Corp.* Nuclear Chicago Corp.* Technical Associates* Tracerlab, Inc. Victoreen Instrument Co.*

193. COUNTERS Anton Electronics Labs, Inc. Atomic Accessories* Baird-Atomic, Inc.* Forro Scientific Co.* Franklin Electronics Corp.* Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Nuclear Corp. of America* Nuclear Electronics Corp.* Nuclear Measurements Corp.* Packard Instrument Co., Inc.* Technical Associates* Technical Measurements Corp.* Texas Nuclear Corp.* Victoreen Instrument Co.* Volk Radiochemical Co. W. M. Welch Manufacturing Co.

194. CRYSTALS Atomic Accessories Baird-Atomic, Inc.* Crystals, Inc.* Isomet Corp.* Nuclear Corp. of America* Nuclear Electronics Corp.* Philips Electronics, Inc.* Technical Measurements Corp.

195. DETECTORS Nuclear Chicago Corp.*

196. DOSIMETRY SERVICE Atomic Accessories* Bendix Aviation Corp.* Nuclear Chicago Corp.* Nuclear Measurements Corp. Technical Associates* Victoreen Instrument Co.*

197. FILTERS Millipore Filter Corp.*

198. GEIGER TUBES Atomic Accessories*

199. GENERATORS, NEUTRON Texas Nuclear Corp.*

200. ISOTOPE LABORATORY EQUIPMENT Volk Radiochemical Co.*

281. PULSE HEIGHT ANALYZERS Baird-Atomic, Inc.* Bendix Aviation Corp. Eldorado Electronics* Franklin Electronics Corp.* Nuclear Chicago Corp.* Nuclear Corp. of America* Nuclear Electronics Corp.* Nuclear Measurements Corp.* Packard Instruments Co., Inc.*

Philips Electronics, Inc.* Technical Associates* Technical Measurements Corp.* Victoreen Instrument Co.*

202. RADIOACTIVITY WARNING TAPES Atomic Accessories*

203. RADIOCHROMATOGRAPHS Forro Scientific Co.*

204. RATEMETERS Anton Electronic Labs., Inc. Forro Scientific Co.* Nuclear Chicago Corp.* Nuclear Corp. of America* Tracerlab, Inc.

205. REMOTE HANDLING DEVICES Central Research Labs.

206. SAMPLE CHANGERS Anton Electronic Labs., Inc. Nuclear Chicago Corp.* Nuclear Corp. of America

207. SCALERS Anton Electronics Laboratories, Inc.* Baird-Atomic, Inc.* Eldorado Electronics* Forro Scientific Co. Franklin Electronics Corp.* Emil Greiner Co. Arthur S. LaPine & Co. Nuclear Chicago Corp.* Nuclear Corp. of America* Nuclear Electronics Corp.* Nuclear Measurements Corp.* Packard Instruments Co., Inc.* Philips Electronics Corp.* Technical Associates* Technical Measurement Corp.* Tracerlab, Inc. Victoreen Instrument Co.*

208. SHIELDING Nuclear Chicago Corp. Nuclear Corp. of America*

209. SOURCES, RADIOCHEMICAL Nuclear Chicago Corp.

210. STANDARDS, RADIOCHEMICAL Nuclear Chicago Corp.*

211. SURVEY METERS Anton Electronics Laboratories, Inc.* Atomic Accessories* Baird-Atomic, Inc.* Emil Greiner Co. Nuclear Chicago Corp.* Nuclear Corp. of America* Nuclear Electronics Corp.* Nuclear Measurements Corp.* Technical Associates* Texas Nuclear Corp.* Victoreen Instrument Co.*

212. TEST CHAMBERS Lahline, Inc.*

RATEMETERS—see radiation equipment

213. RECORDERS American Hospital Supply Corp. American Instrument Co.* Atomic Accessories Barber-Coleman Co.* Consolidated Electrodynamics Corp. Erb g Gray Scientific, Inc. F 8, M Scientific Glassware Co. Fischer & Porter* Fisher Scientific Co.* Forro Scientific Co. Emil Greiner Co. Instrumentation Associates Harold Kruger Co. Arthur S. LaPine & Co. Leeds & Northrup Co.* Microchemical Specialties Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Nuclear Chicago Corp. Nuclear Electronics Corp. Nuclear Measurements Corp. Perkin-Elmer Corp. Phoenix Precision Instrument Co.* Photovolt Corp.* Ε. Η. Sargent g Co.* Schaar & Co. Scientific Glass Apparatus Co. Technical Measurements Corp. Varian Associates*

214. REFINER, ZONE Fisher Scientific Co.* Lindberg Engineering Co.* Research Specialties Co.*



215. REFLECTION METERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Chemical Rubber Co. Erb & Gray Scientific, Inc. Laboratory Equipment Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instruments Co.* Photovolt Corp.* Schaar & Co. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.*

REFLECTOMETERS-see color analyzers

216. REFRACTOMETERS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Bausch & Lomb Optical Co.* C. A. Brinkman & Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Manufacturers Engineering & Equipment

Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Pyrocell Manufacturing Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Valentine Technical Instrument Co.* Wilkens-Anderson Co.

Will Corp. Carl Zeiss, Inc.

217. REFRIGERATORS AND REFRIGERATING EQUIPMENT

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* S. Blickman Co.* Burrell Corp. Cole-Parmer Instrument & Equipment Co. Kovo Laboratory Equipment Co. Meinecke & Co., Inc. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

218. REGULATORS, GAS American Hospital Supply Corp. Atomic Accessories Burrell Corp. Chemical Rubber Co. Consolidated Electrodynamics Corp.* F & M Scientific Glassware Co.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Ce. Instrumentation Associates Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Wil l Corp.

219. REGULATORS, PRESSURE American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co. Fischer & Porter* Fisher Scientific Co. Emil Greiner Co-

Instrumentation Associates Instruments for Research & Industry* Arthur S. LaPine & Co. Loe Engineering Co.* Minneapolis-Honeywell Regulator Co.* Nester & Faust* New York Laboratory Supply Co. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.

REGULATORS, THERMO—see thermo-regulators

220. REGULATORS, VOLTAGE American Hospital Supply Co.* American Instrument Co.* Anton Electronics Laboratories, Inc.* Burrell Corp. Erb & Gray Scientific, Inc. Emil Greiner Co. Arthur S. LaPine & Co. New York Laboratory Supply Co.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.

REMOTE HANDLING DEVICES—see radiation equipment

221. RESEARCH SERVICES Sadtler Research Laboratories*

222. RESISTANCE BOXES Central Scientific Co.* Industrial Instruments, Inc.* Arthur S. LaPine & Co. Leeds & Northrup Co.* Minneapolis-Honeywell Regulator Co.* Schaar & Co. W. M. Welch Manufacturing Co.*

RESPIRATORS—see safety equipment

223. RETORTS Aloe Scientific Division of A. S. Aloe Co. Atkins Technical, Inc. Burrell Corp.

Chemical Rubber Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

224. RHEOMETERS

RING AND BALL APPARATUS—see asphalt testing equipment

225. RINGS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Burrell Corp. Chemical Rubber Co. Coors Porcelain Co.* General Laboratory Supply Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

ROTATORS—see shakers

226. RUBBER TESTING EQUIPMENT American Instrument Co.* C. W. Brabender Instruments, Inc.* C. A. Brinkman & Co.* Burrell Corp. Chemical Rubber Co.

ALUMINA MORTAR AND PESTLE No. S24

COORS U.S.A.

MORTARS A N D

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Coors Mortars and Pestles are available in six styles and forty-nine sizes.

Porcelain, Mullite and Aluminum Oxide mortars and pestles provide the r ight mater ia l for economical and efficient grinding.

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Sizes up to 9 liters in capacity.

AVAILABLE FROM YOUR LABORATORY SUPPLY DEALER

No. 523

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No. 531




Fisher Scientific Co. Em il Greiner Co. Wm. J. Hacker & Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co.

227. SAFETY EOUIPMENT American Instrument Co.* Atomic Accessories* Burred Corp. Cole-Parmer Instrument & Equipment Co. Davis Instruments* Electric Hotpack Co.* Erskine-Healy, Inc.* Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Haws Drinking Faucet Co.* Instruments for Research & Industry* Harold Kruger Co.* Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Meinecke & Co., Inc. New York Laboratory Supply Co. Nuclear Measurements Corp.* Palo Laboratory Supplies, Inc. Parr Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Victory Engineering Co.*

SAMPLE CHANGERS—see radiation equipment

228. SCALES—see also balances Mettler Instrument Corp.

229. SERVICES, ANALYTICAL—see also research service

Chemaster Labs. Clark Microanalytical Lab. Coast Engineering Labs. William B. Johnson Associates Sadtler Research Laboratories* Horace L. Smith, Jr. Wisconsin Alumni Research Foundation

230. SHAKERS & ROTATORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* Burrell Corp.* Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Clay-Adams, Inc.* Harry W. Dietert Corp. Eberbach Corp.* Erb & Gray Scientific, Inc. Fisher Scientific, Co.* Emil Greiner Co. J. P. Greiner 8, Co.* Harshaw Scientific Division of Harshaw Chemical Co. Labline, Inc.* Laboratory Equipment Co. Laboratory Glass & Instruments Corp.* Arthur S. LaPine & Co. Microchemical Specialties* National Appliance Co.* New Brunswick Scientific Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Scientific Industries, Inc.* Sepor Laboratory Supply Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* Waring Products Corp.* Wesco Electric Co.* Wilkens-Anderson Co. Wil l Corp.

SHIELDING—see radiation equipment

SHOWERS—see safety equipment

231. SIEVES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Harry W. Dietert Corp.

Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Supply Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

232. SILICA WARE American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Engelhard Industries* Fisher Scientific Co. General Laboratory Supply Co. Emil Geiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instruments Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

233. SINKS Alberene Stone Corp.* Aloe Scientific* Division of A. S. Aloe Co. American Hospital Supply Corp. S. Blickman Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Laboratory Equipment Co. Arthur S. LaPine & Co. Metalab Equipment Co. Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. U. S. Stoneware Co.* W. M. Welch Manufacturing Co. Will Corp.

234. SOIL TESTING EQUIPMENT Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* C. W. Brabender Instruments, Inc.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Laboratory Equipment Corp.* LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Nalge Co.* New York Laboratory Supply Co. Nuclear Chicago Corp.* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Thermo Electric Manufacturing Co.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

SOURCES, RADIOCHEMICAL—see radiation equipment

235. SPATULAS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co.

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VOL. 3 1 , NO. 4 , APRIL 1959 · 4 7 A

NOW ^ TITRATIONS by

Coors Porcelain Co.* Harry W. Dietert Corp.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Industrial Instruments, Inc.* Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar 8, Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co.* Will Corp.

236. SPECTRA, IR, UV, NEAR IR American Instrument Co.* Baird-Atomic, Inc.* Farrand Optical Co., Inc.* Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Sadtler Research Laboratories Schaar & Co. Tenso-Lab, Inc.

237. SPECTROGRAPHS Applied Research Laboratories* Baird-Atomic, inc.* Bausch 8, Lomb Optical Co.* C. W. Brinkman & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Arthur S. LaPine & Co. Philips Electronics, Inc.* Schaar & Co. Spex Industries, Inc.* Arthur H. Thomas Co. Will Corp.

238. SPECTROMETERS & ACCESSORIES Aloe Scientific Division of A. S. Aloe Co.

Applied Research Laboratories* Baird-Atomic, Inc.* Bausch & Lomb Optical Co.* Burrell Corp. Chemical Rubber Co. Consolidated Electrodynamics Corp.* Ealing Corp. Farrand Optical Co., Inc.* Fisher Scientific Co. General Electric Co.* X-Ray Department Emil Greiner Co. Hamilton Manufacturing Co.* Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Isomet Corp.* Jarrell-Ash Co.* Laboratory Equipment Co. Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Philips Electronics, Inc.* Phoenix Precision Instrument Co.* Prolabo* 0. C. Rudolph* E. H. Sargent 8. Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Corp. Technical Measuremnts Corp.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co.* Will Corp.

239. SPECTROPHOTOMERS AND ACCESSORIES

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Applied Physics Lab.* Baird-Atomic, Inc.* Beckmai Instruments, Inc. Scientific & Process Instruments Div.* C. A. Brinkman & Co. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Farrand Optical Co., Inc.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry*

NEW. LIGHT SCATTERING MEASUREMENTS

AT ELEVATED TEMPERATURES

N E W accessories for the BRICE-PHOENIX L IGHT SCATTERI N G PHOTOMETER permit measurements to be made on polyethylene and similar materials that are solid at room temperature.

INSTRUMENT MEASURES:

• Absolute Turbidity • Dissymmetry

* Depolarization • Molecular Weight

Write for complete information

PHOENIX PRECISION INSTRUMENT CO. 3803-05 N . 5th St., Philadelphia 4 0 , Pa., H.T. Dept.

Jarrell-Ash Co.* Harold Kruger Co.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp. Carl Zeiss, Inc.

240. SPECTROPHOTOMETERS, RECORDING AND ACCESSORIES

American Hospital Supply Corp. Applied Physics Corp.* Baird-Atomic, Inc.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* C. A. Brinkman & Co. Chemical Rubber Co. Chicago Apparatus Co. Erb 8, Gray Scientific, Inc. Farrand Optical Co., Inc.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research 8. Industry* Jarrell-Ash Co.* Harold Kruger Co.* Arthur S. LaPine 8, Co. Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Spectra-Bind Associates* Will Corp. Carl Zeiss, Inc.

241. SPECTROSCOPES Aloe Scientific Division of A. S. Aloe Co. Applied Research Laboratories C. A. Brinkman & Co.* Burrell Corp. Chemical Rubber Co. Ealing Corp. Erb & Gray Scientific, Inc. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Laboratory Equipment Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co.* Will Corp. Carl Zeiss, inc.

STANDARDS, RADIOCHEMICAL—see radiation equipment

242. STERILIZERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Barnstead Still & Sterilizer Co.* Blue M Electric Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Instrumentation Associates Kern Laboratory Supply Co. Labline, Inc.* Laboratory Equipment Co. Arthur s. LaPine & Co. Meinecke & Co., Inc. Millipore Filter Corp.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar 8, Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

STILLS—see distilling apparatus

243. STIRRERS AND BLENDERS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Arrow Engineering Co. J. Bishop & Co. Platinum Works*

C. W. Brabender Instruments, Inc.* Brownwill Scientific Div. of Will Corp. Brookfield Engineering Labs* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Coors Porcelain Co.* Harry W. Dietert Co.* Eastern Industries, Inc. Eberbach Corp.* Erb & Gray Scientific Inc. Fisher Scientific Co.* General Laboratory Supply Co. Emil Grenier Co. J. P. Grenier & Co.* Harshaw Scientific Division of Harshaw Chemical Co. G. K. Heller Co.* Kontes Glass Co.* Labline, Inc.* Arthur S. LaPine & Co. Microchemical Specialties* Mixing Equipment Co., Inc.* New York Laboratory Supply Co-Palo Laboratory Supplies, Inc. Patterson-Kelley Co.* Precision Scientific Co.* Prolabo* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Sepor Laboratory Ivan Sorvall, Inc.* Spex Industries, Inc.* Standard Scientific Supply Co. Tenso-Lab, Inc. Thermo Electric Manufacturing Co.* Arthur H. Thomas Co.* Tri-R Instruments* Waring Products Corp.* W. M. Welch Manufacturing Co.* Wilkens-Anderson Co.* Will Corp.*

244. STOPCOCKS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Consolidated Electrodynamics Corp.* Corning Glass Works* Doerr Glass Co.* Fischer & Porter Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Nalge Co.* Palo Laboratory Supplies, Inc. Podbielniak, Inc.* E. H. Sargent 8, Co. Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilmad Glass Co.* Will Corp.

245. STOPPERS Ace Glass, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Doerr Glass Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Nalge Co.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp. SULFUR APPARATUS—see coal 8, coke

testing apparatus Circle No. 80 A on Readers' Service Card


more and more manufacturers report:

processing with Hanovia photochemical equipment increases output, effects substantial production savings. If your production involves synthesis , decomposition, hydrolysis, hydrogénation, oxidation, reduction, polymerization, bleaching, precipitation, isomeric change, and halogenation, surely it is in your interests to investigate Hanovia Photochemical Equipment. It may prove to effect as substantial savings for you as it has for a rapidly increasing number of manufacturers—large and small.

Hanovia Photochemical Equipment produces greater output in less time with less plant equipment, and with substantial savings. Hanovia Photochemical Equipment has proven the powerful and suitable source for actinically sensitized reactions.

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• Hanovia Laboratory Photochemical Reaction Equipment. Immersion wells, high-pressure mercury-vapor ultraviol e t l a m p s , a n d c o n t r o l s . Enables reaction techniques to be evolved and evaluated. Permits studies of actinic processes, admixture of reactants and temperature control. Fits standard 5 or 12 liter laboratory flasks.

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SULFUR TITRATORS—see combustion equipment

246. SUPPORTS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer instrument & Equipment Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co.* Palo Laboratory Supplies, Inc. Prolabo* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

247. SURFACE TENSION APPARATUS

C. A. Brinkmann & Co.* Central Scientific Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. National Instrument Labs* New York Laboratory Supply Co. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

248. SWITCHES

Torsion Balance Co.*

249. SYRINGES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp.

Chemical Rubber Co. Chicago Apparatus Co. F & M Scientific Glassware Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Hamilton Manufacturing Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co.* Scientific Industries, Inc.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Volk Radiochemical Co. W. M. Welch Manufacturing Co. Will Corp.

250. TEMPERATURE CONTROLLERS American Hospital Supply Corp. American Instrument Co.* Andrew Technical Supply Corp.* Atkins Technical, Inc. Barber-Colman Co.*

Blue M Electric Co.* C. W. Brabender Instruments, Inc.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fischer & Porter Co.* General Laboratory Supply Co. Emil Greiner Co. Instruments for Research & Industry* Arthur S. LaPine & Co. Leeds & Northrup Co.* Loe Engineering Co.* Metal & Controls* Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Thermo Electric Manufacturing Co.* Tri-R Instruments* Victory Engineering Co.*

Will Corp. Yellow Springs Instrument Co.*

TEST CHAMBERS, ENVIRONMENTAL—see laboratory rooms and radiation equipment

251. THERMISTORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Barber-Colman Co. Chemical Rubber Co. Cole-Parmer Instrument & Equipment Co. F & M Scientific Glassware Co.* Instrumentation Associates Arthur S. LaPine & Co. Podbielniak, Inc.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co. Tri-R Instruments* Victory Engineering Co.* Will Corp.

252. THERMOCOUPLES Farrand Optical Co., Inc.*

253. THERMOMETERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. C. A. Brinkmann & Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Cole-Parmer Instrument & Equipment Co. Fisher Scientific Co.* Fish-Schurman General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co. Arthur S. LaPine & Co. Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Perkin-Elmer Corp. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

254. THERMOMETERS, ELECTRIC Ace Glass, Inc.* Atkins Technical, Inc. Barber-Colman Co.* Burrell Corp. Chemical Rubber Co. Cole-Parmer Instrument & Equipment Co. Erb 8. Gray Scientific, Inc. Emil Greiner Co. Arthur S. LaPine & Co. Leeds & Northrup Co.* Minneapolis-Honeywell Regulator Co.* Palo Laboratory Supplies, Inc. Schaar & Co. Scientific Glass Apparatus Co. Ivan Sorvall, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Tri-R Instruments* Victory Engineering Co.* Yellow Springs Instrument Co.*

255. THERMOMETERS, RECORDING Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Atkins Technical, Inc. Barber-Colman Co.* Burrell Corp. Chemical Rubber Co. Cole-Parmer Instrument & Equipment Co. Erb & Gray Scientific, Inc. Fischer & Porter Co.* Fisher Scientific Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine 8* Co. Leeds & Northrup Co.* Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* E. H. Sargent & Co. Schaar & Co. Tenso-Lab, Inc. W. M. Welch Manufacturing Co. Yellow Springs Instrument Co.*

256. THERMOREGULATORS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp.

5 0 A · A N A L Y T I C A L CHEMISTRY

ENGELHARD INDUSTRIES, INC.

American Instrument Co.* Atkins Technical, Inc. Barber-Colman Co.* C. W. Brabender Instruments, Inc.* C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instruments for Research & Industry* Laboratory Glass & Instrument Corp.* Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp. Yellow Springs Instrument Co.*

257. TIMERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Andrew Technical Supply Corp.* Atomic Accessories Baird-Atomic, Inc.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Clay-Adams, Inc.* Cole-Parmer Instrument & Equipment Co. Dimco-Gray Co.* Electric Hotpack Co.* Erb & Gray Scientific, Inc. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Instrumentation Associates Labline, Inc.* Arthur S. LaPine & Co. New .York Laboratory Supply Co. Nuclear Chicago Corp.* Palo Laboratory Supplies, Inc. Photovolt Corp.* Precision Scientific Co.* Presin Co.* Jules Racine & Co., Inc.* E. H. Sargent & Co. Schaar & Co. Scientific Industries, Inc.* Scientific Glass Apparatus Co. Ivan Sorvall, Inc. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

258. TITRATION APPARATUS, AUTOMATIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* Beckman Instruments, Inc. Scientific 8. Process Instruments Div.* C. A. Brinkmann & Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Chicago Apparatus Co. Coleman Instruments Co., Inc.* Erb & Gray Scientific, Inc. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Harold Kruger Co.* Laboratory Glass & Instrument Corp.* Arthur S. LaPine & Co. Lindberg Engineering Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Photovolt Corp.* Polarad Electronics Corp.* Precision Scientific Co.* Ε. Η. Sargent & Co.* Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

259. TONGS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atomic Accessories Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Clay-Adams, Inc.* Fisher Scientific Co.* General Laboratory Supply Co.

Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wil l Corp.

TRANSFORMERS—see power supply

260. TRANSISTORS Baird-Atomic, Inc.* Chemical Rubber Co. Scientific Glass Apparatus Co.

261. TRAYS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Andrew Technical Supply Corp.* Bel-Art Products* S. Blickman Co.* Burrell Corp. Chemical Rubber Co. Corning Glass Works* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co., Inc. Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Thermal American Fused Quartz Co., Inc.* Arthur H. Thomas Co.

262. TUBES, ELECTRONIC Baird-Atomic, Inc.* Chemical Rubber Co. Emil Greiner Co. New York Laboratory Supply Co. Radio Corp. of America* Scientific Glass Apparatus Co. Arthur H. Thomas Co.

263. TUBES, TEST Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Corning Glass Works* Doerr Glass Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Kontes Glass Co.* Arthur S. LaPine & Co. Meinecke & Co., Inc. Microchemical Specialties* Nalge Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Thermal American Fused Quartz Co., Inc.* Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

264. TUBING, RUBBER, PLASTIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bel-Art Products* Bethlehem Apparatus Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Engelhard Industries* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Meinecke & Co. Nalge Co.* Norton Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Glass Co.

Tenso-Lab, Inc. Arthur H. Thomas Co. U. S. Stoneware Co.* W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

265. TURBIDIMETERS American Instrument Co.* Baird-Atomic, Inc.* Beckman Instruments, Inc. Scientific & Process Instruments Div.* C. A. Brinkmann & Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co.* Phoenix Precision Instrument Co.* Photovolt Corp.* Precision Scientific Co.* Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

ULTRACENTRIFUGES—see centrifuges

266. ULTRASONIC CLEANING EQUIPMENT—see also cleaning equipment

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atomic Accessories Burrell Corp. Chemical Rubber Co. Erb & Gray Scientific, Inc. Forro Scientific Co. Instrumentation Associates Labline, Inc.* Lindberg Engineering Co.* Meinecke & Co. Palo Laboratory Supplies, Inc. Schaar & Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Wilkens-Anderson Co.

267. ULTRAVIOLET EQUIPMENT LKB Produkter Fabriksaktiebolag*

268. VACUUM EQUIPMENT—see also pumps

Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. American Instrument Co.* James G. Biddle Co. S. Blickman Co.* Burrell Corp. Central Scientific Co.* Chemical Rubber Co. Consolidated Electrodynamics Corp.* Electric Hotpack Co.* Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kontes Glass Co.* Laboratory Equipment Co. LKB Produkter Fabriksaktiebolag* Arthur S. LaPine & Co. National Appliance Co.* Nelson Vacuum Pump Co.* New York Laboratory Supply Co. NRC Equipment Corp.* Nuclear Corp. of America* Palo Laboratory Supplies, Inc. Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. W. M. Welch Manufacturing Co.* Wilkens-Anderson Co. Wil l Corp.

269. VACUUM REGULATORS American Hospital Supply Corp. American Instrument Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. Emil Greiner Co. Instruments for Research & Industry* Kontes Glass Co.* Arthur S. LaPine & Co. Minneapolis-Honeywell Regulator Co.* National Instrument Labs* Palo Laboratory Supplies, Inc. Precision Scientific Co.* Schaar & Co. Scientific Glass Apparatus Co.

270. VALVES Aloe Scientific Division of A. S. Aloe Co.

American Instrument Co.* Burrell Corp. Chemical Rubber Co. Consolidated Electrodynamics Corp.* Erb & Gray Scientific, Inc. Emil Greiner Co. Arthur s . LaPine & Co. Manufacturers Engineering & Equipment

Co.* Minneapolis-Honeywell Regulator Co.* New York Laboratory Supply Co. NRC Equipment Corp.* Oregon Metallurgical Corp.* Palo Laboratory Supplies, Inc. Parr Instrument Co.* Podbielniak, Inc.* Ruska Instrument Corp.* Schaar & Co. Scientific Glass Apparatus Co.

VAN SLYKE APPARATUS—see blood testing equipment

271. VIBRATORS Sepor Laboratory Supply*

272. VISCOMETERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* Bendix Aviation Corp.* C. W. Brabender Instruments, Inc.* Brookfield Engineering Labs* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. Fish-Schurman* General Laboratory Supply Co. Emil Greiner Co.* Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Polarad Electronics Corp.* Precision Scientific Co.* Ruska Instrument Corp.* E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

273. VISCOSIMETERS Aloe Scientific Division of A. S. Aloe Co. American Instrument Co.* C. W. Brabender Instruments, Inc. C. A. Brinkmann & Co.* Brookfield Engineering Labs* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fischer & Porter Co.* Fisher Scientific Co.* Fish-Schurman* General Laboratory Supply Co. Emil Greiner Co. William J. Hacker Co., Inc. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Microchemical Specialties* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Polarad Electronics Corp.* Precision Scientific Co.* Ε. Η. Saigent & Co.* Schaar & Co. Scientific Glass Apparatus Co.* Standard Scientific Supply Corp. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Wil l Corp.

VOLTMETERS—see ammeters

WARBURG APPARATUS AND ACCESSORIES—see blood testing equipment

W A S H I N G EQUIPMENT—see cleaning equipment

274. WATER ANALYSIS EQUIPMENT Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Atkins Technical, Inc. Barnstead Sti l l & Sterilizer Co.* Burreli Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Harold Kruger Co.* Laboratory Equipment Co. Arthur S. LaPine & Co. LaMotte Chemical Products Co.* Manufacturers Engineering & Equipment

Co.* Milllpore Filter Corp.*


New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Precision Scientific Co.* Ε. Η. Sargent & Co.* Scbaar & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Standard Scientific Supply Co. W. A. Taylor & Co., Inc.* Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

279. WATER PURIFICATION EQUIPMENT Barnstead Still & Sterilizer Co.* Burrell Corp. Cole-Parmer Instrument & Equipment Co. Fischer & Porter Co.* Emil Greiner Co. Illinois Water Treatment Co.* Arthur S. LaPine & Co. Millinore Filter Corp.* Precision Scientific Co.* E. H. Sargent & Co. Schaar & Co. Scientific Equipment Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Wilkens-Anderson Co.

WEIGHTS—see balances

WHEATSTONE BRIDGE—see resistance boxes

276. WIRE Burrell Corp. Fisher Scientific Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Metal & Controls* New York Laboratory Supply Co. Oregon Metallurgical Corp.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Schaar & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. W. M. Welch Manufacturing Co.

277. X-RAY EOUIPMENT Applied Research Labs* Chicago Apparatus Co. General Electric Co.* High Voltage Engineering Corp.* Jarrell-Ash Co.* Philips Electronics, Inc.* Tracerlab, Inc.

ZONE REFINER—see refiner, zone

CHEMICALS AND MATERIALS 278. ABRASIVES Norton Co.*

279. ABSORBENTS, CHROMATOGRAPHY Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chicago Apparatus Co. Davis Instruments Ealing Corp. F 8. M Scientific Glassware Co. Fisher Scientific Co. Floridin Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Johns-Manville Corp.* Loe Engineering Co. Mallinkrodt Chemical Works* Merck & Co.* Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Research Specialties Co. E. H. Sargent & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

280. ABSORBENTS, FILTRATION Aloe Scientific Division of A. S. Aloe Co. Floridin Co.* Harshaw Scientific Division of Harshaw Chemical Co. Johns-Manville Corp.* Merck & Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co.

Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Arthur H. Thomas Co.

281. ABSORBENTS, GAS Burrell Corp.* Chicago Apparatus Co. Eastman Kodak Co.* Fisher Scientific Co. Floridin Co.* General Laboratory Supply Co. Emil Greiner Co. Hartman-Leddon Co., Inc.* Mallinkrodt Chemical Works* New York Laboratory Supply Co. E. H. Sargent & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

282. ACIDS, INORGANIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Baker-Adamson Products* Div. of Allied Chemical Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc. Arthur S. LaPine & Co. Mallinkrodt Chemical Works* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

283. ACIDS, ORGANIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Baker-Adamson Products Div. of Allied Chemical Corp. J. Bishop & Co. Platinum Works* Chemical Rubber Co. Chicago Apparatus Co. Ealing Corp. Eastman Chemical Products Eastman Kodak Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc. Arthur S. LaPine 8, Co. Mallinkrodt Chemical Works* Matheson Co., Inc.* Merck & Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

284. ADHESIVES Eastman Chemical Products Fisher Scientific Co. fmi l Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. E. H. Sargent & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

285. ALLOYS, SPECIAL J. Bishop & Co. Platinum Works* Harshaw Scientific Division of Harshaw Chemical Co. Metals & Controls* Oregon Metallurgical Corp.

286. BATTERIES National Carbon Co.

287. BUFFER TABLETS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chicago Apparatus Co. Coleman Instruments Co., Inc.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

N0W...ACCURATE TEMPERATURE DATA W i t h 1 1ν£ΛΛ11_ίΓΎ1>*_1-Ι_

THERMISTOR THERMOMETER

• ACCURACY: 70°C/range 20°C/range

- 50° to 50°C ±0.7°C ±.15°C + 5 0 ° t o l 0 0 ° C ±1.0°C ±.2°C + 100°to200°C =fcl.5°C ±.3°C Readability .25° .1° • FASTEST RESPONSE: time constant: .75

seconds in liquids; 2.2 seconds on surfaces. • ONE HUNDRED INTERCHANGEABLE

PROBES, TWENTY-SIX INSTRUMENTS Readings between —328°F to 845°F or C equivalent.

• BATTERY POWERED, as pictured, or AC models (portable or pane] mountable).

• STABLE EUROPEAN THERMISTOR resistance element, bridge circuit and amplifier.

USED BY G . E., duPont, Westinghouse, etc.

INTRODUCTORY

OFFER COMPLETE $18022

Instrument as pictured, °F or °C. Temperature range; overlapping:

Model #4412F Mode! #4412C Scale I . . 32 ° to .58°F . . 0° to 70°C Scale II . . 158°to284°F . . 70° to 140°C Scale III . . 284°to410°F . . 140° to2 I0°C

with one probe, choice of . . . #H10AO stainless steel for surfaces

#H01AF glass tipped for liquids #H12AF stainless steel needle

ATKINS TECHNICAL, INC. 1276 West T h i r d Street

C l e v e l a n d 1 3 , O h i o · T e l e p h o n e : S U 1 - 1 3 3 3 Circle Nos. 55 A-1, 55 A-2 on Readers' Service Card

Now in Use in Thousands of Labs!

PROPIPETTE The safe accurate

Pipette Filler for

Isotopes, Cyanides,

Acids, Bacteria and

Other D a n g e r o u s

Solutions

This amazing new instrument is now standard equipment in government, medical and industrial laboratories throughout the nation. Offers more precise measurement (to 0.01 cc), more complete control, and avoids all the risks of mouth pipetting. Holds set level indefinitely, fits any pipette, operates easily with one hand. Order a supply of PRO-P I P E T T E S now, $6.90 each.

INSTRUMENTATION ASSOCIATES 17 West 60th Street, New York 23, Dept. R-49 Send for current list of new scientific instruments

Circle No. 86 A on Readers' Service Card VOL 3 1 , NO. 4, APRIL 1959 · 5 3 A

288. CATALYSTS Englehard Industries*

289. CEMENTS Central Scientific Co.*

290. CHEMICALS, BIOLOGICAL GRADE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Baker-Adamson Products* Div. of Allied Chemical Corp. Chicago Apparatus Co. Ealing Corp. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works* Matheson Co., Inc.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. w . M. Welch Manufacturing Co. Will Corp.

291 . CHEMICALS, CHROMATOGRAPHIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. J. T. Baker Chemical Co.* Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Coast Engineering Laboratory Ealing Corp. Eastman Kodak Co.* F. 8, M Scientific Glassware Co.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Mallinkrodt Chemical Works* Matheson Co. Inc.* Merck & Co.* Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Research Specialties Co.* Rohm & Haas Co.* E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

292. CHEMICALS, COMBUSTION APPARATUS

Aloe Scientific Division of A. S. Aloe Co. Burrell Corp.* Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Laboratory Equipment Corp.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

293. CHEMICALS, INDUSTRIAL American Hospital Supply Corp. Baker-Adamson Products* Div. of Allied Chemical Corp. J. Bishop & Co. Platinum Works* Chicago Apparatus Co. E. I. DuPont de Nemours & Co., Inc.* Eastman Chemicals Products Eastman Kodak Co.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works* Matheson Co., Inc. Norton Co.* Palo Laboratory Supplies, Inc. Scientific Glass Apparatus Co. W. M. Welch Manufacturing Co.

294. CHEMICALS, ISOTOPES Atomic Accessories Baker-Adamson Products* Div. of Allied Chemical Corp. Eastman Kodak Co.* Harshaw Scientific Division of Harshaw Chemical Co. Isomet Corp.* New England Nuclear Corp.*

Nuclear Chicago Corp. Research Specialties Co.* Scientific Glass Apparatus Co. Volk Radiochemical Co.

295. CHEMICALS, LABORATORY Aloe Scientific* Division of A. S. Aloe Co. American Hospital Supply Corp. Baker-Adamson Products* Div. of Allied Chemical Corp. J. T. Baker Chemical Co.* J. Bishop & Co. Platinum Works* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Distillation Products Industries E. I . du Pont de Nemours & Co., Inc.' Ealing Corp. Eastern Chemical Corp.* Eastman Kodak Co.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc.* Kern Laboratory Supply Co. LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works* Matheson Co., Inc.* Merck & Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Parr Instrument Co.* E. H. Sargent & Co. Scientific Glass Apparatus Co. Southwestern Analytical Chemicals* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Wil l Corp.

296. CHEMICALS, POLAROGRAPHIC Southwestern Analytical Chemicals*

297. CHEMICALS, RADIOACTIVE Atomic Accessories, Inc. Baker-Adamson Products* Div. of Allied Chemical Corp. Harshaw Scientific Division of Harshaw Chemical Co. Mallinkrodt Chemical Works* New England Nuclear Corp.* Nuclear Chicago Corp. Research Specialties Co.* Volk Radiochemical Co.

298. CHEMICALS, REAGENT GRADE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Arapahoe Chemicals, Inc.* Baker-Adamson Products* Div. of Allied Chemical Corp. J. T. Baker Chemical Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. E. I . DuPont de Nemours & Co., Inc.* Ealing Corp. Eastern Chemical Corp.* Eastman Kodak Co.* Fisher Scientific Co.* General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc.* Kern Laboratory Supply Co. LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works* Matheson Co., Inc.* Merck 8, Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Southwestern Analytical Chemicals* Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

299. CHEMICALS, SCINTILLATION Packard Instrument Co. Inc.* Pilot Chemicals, Inc.

300. CHEMICALS, SPECTROPHOTOMETRIC Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Chicago Apparatus Co. Ealing Corp. Eastman Kodak Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Mallinkrodt Chemical Works*

Matheson Co., Inc.* Merck & Co.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Wilkens-Anderson Co. Will Corp.

301. CHROMATOGRAPHY PAPER Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Eaton-Dikeman* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. LKB Produkter Fabriksaktiebolag* Microchemical Specialties New York Laboratory Supply Co. Oxford Laboratories* Palo Laboratory Supplies, Inc. Podbielniak, Inc.* Research Specialties Co. Ε. Η. Sargent f» Co. Carl Schleicher 8, Schuell Co.* Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wilkens-Anderson Co. Will Corp.

302. CHROMATOGRAPHY SUPPLIES Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Barber-Coleman Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Davis Instruments* Ealing Corp. F & M Scientific Glassware Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Jarrell-Ash Co.* Johns-Manville Corp.* Arthur S. LaPine & Co. Loe Engineering Co.* Microchemical Specialties New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Phoenix Precision Instrument Co.* Podbielniak, Inc.* Research Specialties Co.* E. H. Sargent & Co. Scientific ulass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wilkens-Anderson Co. Will Corp.

303. CLEANING COMPOUNDS Alconox, Inc.* Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chicago Apparatus Co. Fisher Scientific Co.* Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.

304. COMPRESSED GASES & MIXTURES Baker-Adamson Products* Div. of Allied Chemical Corp. Burrell Corp. General Laboratory Supply Co. Arthur S. LaPine & Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Superior Air Products*

CORKS—see stoppers

305. CULTURE MEDIA Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Chicago Apparatus Co. General Laboratory Supply Co. Emil Greiner Co. Arthur S. LaPine & Co. Millipore Filter Corp.*

New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

306. DESICCANTS American Hospital Supply Corp. Burrell Corp. Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Mallinkrodt Chemical Works* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Ε Η. Sargent & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Wil l Corp.

307. ELECTRODES, GRAPHITE Aloe Scientific Division of A. S. Aloe Co. Applied Research Laboratories Fisher Scientific Co. Jarrell-Ash Co.* National Carbon Co.* Division of Union Carbide Corp. E. H. Sargent & Co. United Carbon Products Co., Inc.*

308. ELECTRODES, METALLIC American Hospital Supply Corp. Chemical Rubber Co. Metals & Controls* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc.

309. ELECTRODES, SPECTROSCOPIC National Carbon Co.*

310. FILM, OSCILLOGRAPHIC Eastman Kodak Co.*

311. FILM, PHOTOGRAPHIC Applied Research Laboratories Eastman Kodak Co.* F & M Scientific Glassware Co.

312. FILM, X-RAY Eastman Kodak Co.* General Electric Co.* X-Ray Department

313. FILTER PAPERS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. H. Reeve Angel 8, Co.* Baker-Adamson Products* Div. of Allied Chemical Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Eaton-Dikeman* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. Meinecke & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Research Specialties Co. E. H. Sargent & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

314. FILTERS, GLASS FIBER H. Reeve Angel & Co.* Burrell Corp. Chicago Apparatus Co. General Laboratory Supply Co. Emil Greiner Co. New York Laboratory Supply Co. E. H. Sargent & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co.

315. FILTERS, POROUS MEMBRANE Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Barnstead Sti l l & Sterilizer Co.* Burrell Corp.


Emil Greiner Co. Millipore Filter Corp.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Will Corp.

316. FILTER PULP H. Reeve Angel & Co. Baker-Adamson Products* Div. of Allied Chemical Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co.* General Laboratory Supply Co. New York Laboratory Supply Co. E. H. Sargent & Co. Carl Schleicher & Schuell Co.* Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co.

317. FOIL, METAL Engelhard Industries* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Metals 8. Controls* Oregon Metallurgical Corp.* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Arthur H. Thomas Co.

GASES—see compressed gases

318. GRAPHITE SUPPLIES Applied Research Laboratories General Laboratory Supply Co. Emil Greiner Co. National Carbon Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. United Carbon Products Co., Inc.*

GREASES—see sealants

319. INDICATORS, CHEMICAL Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Ealing Corp. Eastern Chemical Corp.* Eastman Kodak Co.* Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Hartman-Leddon Co., Inc.* LaMotte Chemical Products Co.* Arthur S. LaPine & Co. Matheson Co., Inc.* New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. W. A. Taylor & Co., Inc.* Arthur H. Thomas Co. Will Corp.

ION EXCHANGE RESINS—see resins, exchange

320. LABELS Aloe Scientific Division of A. S. Aloe Co. Andrew Technical Supply Co.* Burrell Corp. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Labelon Tape Co., Inc.* Meinecke & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Will Corp.

321. MERCURY Central Scientific Co.*

322. METALS, HIGH PURITY Baker-Adamson Products* Div. of Allied Chemical Corp. Bethlehem Apparatus Co.* J. Bishop & Co. Platinum Works* General Laboratory Supply Co. Jarrell-Ash Co.* Kern Laboratory Supply Co. Mallinkrodt Chemical Works* Metals & Controls*

Oregon Metallurgical Corp.* E. H. Sargent & Co. Scientific Glass Apparatus Co. Spex Industries, Inc. Arthur H. Thomas Co.

323. MILK TESTING MATERIALS

324. PENCILS, MARKING Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Arthur S. LaPine & Co. New York Laboratory Supply Co. Oxford Laboratories* Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co. W. M. Welch Manufacturing Co. Wil l Corp.

325. PLASTICS American Agile Corp.* Eastman Chemicals Products General Laboratory Supply Co. Emil Greiner Co. Arthur S. LaPine & Co. Nalge Co.* Palo Laboratory Supplies, Inc. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* U. S. Stoneware Co.*

326. PLASTIC TAPE Chemical Rubber Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co.

327. POWDERS, SPECTROSCOPIC Applied Research Laboratories Emil Greiner Co. Jarrell-Ash Co.* National Carbon Co.* Spex Industries, Inc.* United Carbon Products Co., Inc.

328. REFRACTORIES Norton Co.

329. RESINS, ION EXCHANGE Aloe Scientific Division of A. S. Aloe Co. Bio-Rad Laboratories Chicago Apparatus Co. Fisher Scientific Co. Emil Greiner Co. Arthur S. LaPine & Co. Microchemical Specialties New York Laboratory Supply Co. Phoenix Precision Instrument Co.* Rohm & Haas Co.* E. H. Sargent & Co. Scientific Glass Apparatus Co. Tenso-Lab, Inc. Arthur H. Thomas Co. Will Corp.

330. SEALANTS & GREASES Glass Engineering Labs.

331. STOPPERS & CORKS Aloe Scientific Division of A. S. Aloe Co. American Hospital Supply Corp. Bethlehem Apparatus Co.* Burrell Corp. Chemical Rubber Co. Chicago Apparatus Co. Fisher Scientific Co. General Laboratory Supply Co. Emil Greiner Co. Harshaw Scientific Division of Harshaw Chemical Co. Kern Laboratory Supply Co. Arthur S. LaPine & Co. Meinecke & Co. New York Laboratory Supply Co. Palo Laboratory Supplies, Inc. E. H. Sargent & Co. Scientific Glass Apparatus Co. Standard Scientific Supply Co. Tenso-Lab, Inc. Arthur H. Thomas Co.* W. M. Welch Manufacturing Co. Will Corp.

332. VACUUM SEALANTS James G. Biddle Co.*

YOU at the Kern booth at the recent Congress at V i e n n a , where you expressed keen interest in and mentioned the demand here for the

SAID IT!

KERN LK 3 0 MICROELECTROPHORESIS

APPARATUS

Now we can tell you t h a t here is an outstandingly reliable pilot instrument. Using only 0.1 cc. of sample, i t clearly shows in the eyepiece, each and every component over the entire horizontal cross-section of the cell. You press a but ton and the built-in camera makes a peraianent record, suitable for plotting percentages. Other advantages include small size, actual portability, and speed. Bulletin Med 505 gives more details. Ask us for it. Ask, too, for KP 567 describing the KERN FULL-CIRCLE POLARIMETER (now equipped with 30 mm. i.d. trough for "standard" tubes).

Sole National Agents

K E R N C O M P A N Y 7 Beekman Street, Ν. Υ. 38 Circle No. 73 A on Readers' Service Card

Phoenix Precision Absorption Cells

Available in pyrex, quartz, corex, and optical glass. Fabricated in a wide variety of shapes and sizes. Rigid tolerances held, optically and dimensionally. Demountable type cells also available. . . .

Special cells designed and built to specification.

PHOENIX PRECISION INSTRUMENT CO. 3803-05 N. 5th St., Philadelphia 40, Pa.


VOL. 3 1 , NO. 4, APRIL 1959 · 5 5 A

ADVERTISERS' PRODUCT GUIDE

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