ASSOCIATIONS

C h e m i s t r y bu i l d ing , Univers i ty of W i s c o n s i n

On ίο Wisconsin

I. Aliphatic Alcohols and Carboxync Acids Adsorbed from Aqueous Solutions on Graphon.

J. R. Z I M M E R M A N , B. G. H O L M E S , J. A. LASATER. A Study of Adsorbed Water in Silica Gel by Nuclear Resonance Tech­niques.

J. L. SHERESHEFSKY, C. E. W E I R . Ad­sorption of Gases and Vapors on Glass Spheres. II. Two-Dimensional Conden­sation of Oxygen.

J. L. SHERESHEFSKY, E. R. RUSSELL. Activated Adsorption of Oxygen on Glass.

JOHN W. ROSS, ROBERT J. GOOD. Ad­sorption and Surface Diffusion of τι-Butane on Spheron 6 (2 7 0 0 ° ) Carbon Black.

L. H. REYERSON, LOWELL E. PETERSON. The Sorption of Gases by Solid Polymers. I. The Sorption of Ammonia by Nylon. I I . The Sorption of Hydrogen Chloride by Nylon.

H. L. FRISCH. Gas Permeation Through Membranes D u e to Simultaneous Diffu­sion and Convection.

J. J. CHESSICK, A. C. ZETTLEMOYEE, Studies of the Surface Chemistry of Sili­cate Minerals. IV. Adsorption and Heat of Wetting Measurements of Attapulgite.

ROBERT S. H A N S E N , ROBERT E . M I N -TURN, D O N A L D A. HICKSON. T h e Infer­ence of Adsorption from Differential Double-Layer Capacitance Measurements.

J L H E 3 0 t h N a t i o n a l Co l lo id S y m p o ­s ium, J u n e 18 to 2 0 ; t h e mee t ing of t h e divis ion of h igh p o l y m e r physics of t h e A m e r i c a n Phys ica l Socie ty , J u n e 2 0 a n d 2 1 , a n d t h e S y m p o s i u m on V a l e n c y a n d C h e m i c a l B o n d i n g to b e h e l d b y t h e A C S Division of Phys i ca l a n d I n ­o r g a n i c C h e m i s t r y a n d the A P S divi­sion of chemica l p h y s i c s , will t ake p l a c e in M a d i s o n , W i s . T h e ACS Wiscons in Sec t ion will b e hos t .

In add i t i on to a t echn ica l p r o g r a m w h i c h inc ludes d e l i v e r y of over 9 0 p a p e r s in the t h r e e even t s , t h e r e wi l l b e a M o n d a y e v e n i n g a d d r e s s b y F a r -r i n g t o n Dan ie l s of t h e Univers i ty o f Wiscons in on F u t u r e K n e r g y Sou rce s . T h e foreign g u e s t of honor, R. M . Ba r r e r , professor of c h e m i s t r y a t Abe r ­d e e n Univers i ty , wil l a d d r e s s the m e e t ­ing T u e s d a y e v e n i n g on Aspec t s of In t r ac rys t a l l i ne S o r p t i o n .

W . O . Mi l l igan of Rice I n s t i t u t e is c h a i r m a n of t h e s y m p o s i u m . Ses ­sions of t h e Col lo id S y m p o s i u m a n d t h e A P S division of h i g h p o l y m e r p h y s i c s wil l b e he ld in t h e chemis t ry b u i l d i n g a t t h e univers i ty . R o o m s will b e avai l ­a b l e in a d o r m i t o r y ( E l i z a b e t h W a t e r s H a l l ) a n d mea l s will b e se rved t h e r e f rom breakfas t on J u n e 18 t h r o u g h l u n c h on J u n e 2 1 excep t for M o n d a y e v e n i n g w h e n t h e b a n q u e t is s c h e d ­u l e d . Cost p e r p e r s o n for r o o m a n d m e a l s will b e a b o u t $ 6 . 0 0 a day . Regis ­t r a t i o n forms a n d fur ther in fo rma t ion m a y b e o b t a i n e d f rom Rober t A. A l -b e r t y , D e p a r t m e n t of C h e m i s t r y , U n i ­

versity of Wiscons in , M a d i s o n 6, W i s . A smoker a n d social e v e n i n g h a v e

b e e n p l a n n e d for W e d n e s d a y and will b e held in t h e U n i o n Rathskel le r a n d on the t e r r a c e .

For t h o s e a t t e n d i n g t h e S y m p o s i u m on Valency a n d Chemica l Bonding , rooms will b e ava i lab le in L a n g d o n Ha l l from T u e s d a y even ing to Sa tu rday morn ing . Cos t p e r n ight will be $3 .50 for single rooms and $3 .00 p e r person for t w i n - b e d d e d rooms. Reserva t ions should b e m a d e as soon as possible. Those p r e f e r r i n g hote l reservat ions should con tac t t h e ho te l direct ly. A b a n q u e t in t h e union bu i ld ing is p l a n n e d for T h u r s d a y even ing a n d breakfas t on t h e three d a y s will be avai lab le in t h e p u b l i c d in ing rooms of t h e union . L u n c h e o n will b e served in a p r i v a t e d in ing room. All m e a l reservat ions shou ld b e m a d e at t he t ime of mail regis t ra t ion .

For r eg i s t r a t i on forms a n d fur ther in­format ion wr i t e t o C. F . Cur t i ss , P . O. Box 2127 , M a d i s o n 5, W i s .

PROGRAM MONDAY

Sections A and Β

HAROLD J. D A W E . Edward Goodrich Acheson—Pioneer in Colloid Chemistry.

Section A

Adsorption DONALD G R A H A M , ROBERT S. HANSEN.

The Structures of Adsorbed Monolayers.

MONDAY

Section Β

Effects of High Energy Radiation in Colloidal and High Polymeric Material

IRVING A. BREGER, EDWARD B. BRITTIN. Effects of Radiation on Coals.

L E O A. W A L L . Gamma Irradiation of Polymethyl Methacrylate and Polystyrene.

L E O N M. D O R F M A N . Molecular De­tachment of Hydrogen in the Radiolysis of Some Hydrocarbon Polymers ( and Gaseous Hydrocarbons) .

J A M E S A. SNELGROVE. The Effects of High Energy Electrons on Polyvinyl Ace­tate.

E R N E S T J. H E N L E Y , M I T C H E L L L I T T . Degradation of Vinyl Iodide Polymer by Gamma Radiation.

W. K. W. C H E N , R. B. MESROBIAN, D. S. BALLANTINE, D. J. M E T Z , A. GLINES. Study of the Mechanism of Graft Copoly-merization and the Synthesis of Graft Co-rpolymers with Interesting Physical Proper­ties.

S. OKADA. Protection of Desoxyribo-nuclease from Radiation by Adsorbents.

H. FRICKE, W. LANDMANN, C. A. L E O N E . Studies on Structural Reactions in Proteins Under the Influence of Ioniz­ing Radiations.

JACK C. S M I T H . The Effect of High Energy Radiations on the Physical Prop­erties of Textile Fibers Irradiated in Air.

M A L C O L M D O L E , W . H. HOWARD. Melting Behavior of Irradiated Poly­ethylene.

C. A. L E O N E . Structural Changes in Ovalbumin D u e to Gamma Radiation.

R. Η. MAYBERRY. Urea Denaturation of Irradiated Ovalbumin.

2 4 2 8 C & E N M A Y 14, 1956

cçThis free-flowing form of Du Pont Urea has permitted quite a number of users in my area to simplify and speed up processing." This report from D u Pont Poly chemicals representative Bob Harbour is typical of comments received during recent months.

An evaluation of Du Pont Shotted Urea in your operations may prove to be the answer to one of your process­ing problems. Or if you require urea i n its crystalline form, remember that D u Pon t Crystal Urea still sets the standard for purity for all industrial chemicals . » . no other chemical product sold in tonnage lots has higher purity.

Few other chemicals, too, have a w ide r range of app l ica t ions t han D u Pon t Urea. Urea-formaldehyde resin adhesives . . . wet-strength coat­ings textile sizes and finishes... and urea-formaldehyde molding compo­sitions are a few of the principal uses for this versatile chemical. Strict ad­herence to rigid specifications assures t h e user of dependable purity and uniformity.

In order to speed deliveries to you, D u Pont is currently expanding its distribution facilities. Prompt ship­ments can now be made from a num­ber of stock points strategically lo­cated throughout the country.

We have information about Du Pont Crystal Urea and Du Pont Shotted Urea which may be helpful to you. Simply use the coupon and we will send it on to you promptly.

iPflfc R E S . U . S . PAT. OFF.

B E T T E R T H I N G S F O R B E T T E R L I V I N G ...THROUGH CHEMISTRY

BOB HARBOUR is sales representative for the Du Pont Polychemicals Dept. in northeastern Ohio,western Pennsylvania and western NewYork. Bob, a graduate chemical engineer from Ohio

State, ha s had extensive experience in serving the chemical process industries. Like his fellow sales­men, Bob isequipped to work closely with customers in determining individual chemical requirements.

FOR ADDITIONAL INFORMATION ON SPECIFICATIONS, PROPERTIES AND USES, M/XIL THIS COUPON

Which of these

other chemicals are

you interested in?

D ADIPIC ACID

Π DIGLYCOLIC ACID Π HYDROXYACETIC ACID D HYTP.OL® Ο

CYCLOHEXANONE Π LOROL® FATTY

ALCOHOLS Π METHANOL

E. I. du Pont de Nemours & Co. (Inc.) Polychemicals Dept . 575, 'Wilmington 98 , Del.

Please send me full information on Du Pont Crystal Urea and Shotted Urea. I am part icularly interested in evaluating these products for t he following applications:

Name Firm Address_ City

Position _

_State_

"Many customers report our new 'shotted' urea

fits their needs perfectly"

ASSOCIATIONS

I n this Controlled Volume Pump, a pneumatic piston operator receives an instrument air signal and ac tua tes a variable speed transmission. Pump speed i s automatically adjusted t o process demand . Servo systems for automatic adjustment of stroke length by instru­ment a i r signal also available.

Broad, flexibility for metering process additives I f you. p u m p a n d me te r chemicals against a head . . . o r m a i n t a i n fixed r a t io s of t w o o r more chemical s t r e a m s . . . o r a u t o m a t i c a l l y r e g u l a t e flow o f a con t ro l agent in a con t ro l sys tem, such as p H , t h e r e ' s a M i l t o n R o y Cont ro l l ed Volume P u m p t h a t ' s exact ly right for you r app l i ca t ion .

Avai lable from Mi l ton Roy are m a n y flexible a d a p t a t i o n s in s implex , d u p l e x a n d formula t ing p u m p designs, w i t h m a n u a l or a u t o m a t i c a d j u s t m e n t s o f s troking l eng th or speed. Capac i t i e s r ange f rom 3 milli l i ters per hour t o 45 g p m , pressures u p to 50,000 ps i . Accuracy o f del ivery is w i t h i n plus o r m i n u s one percent . L i q u i d ends a r e fur­n i s h e d in a wide selection of a l loys and in plast ic . S a n i t a r y des ign, t oo .

H a v e you inves t iga ted how you can reduce chemical cos ts a n d u p ­g r a d e product qua l i ty by us ing cont ro l led vo lume p u m p s ? One of t h e "bulletins l i s t ed probably c o n t a i n s t h e economical a n s w e r t o your chemical me te r ing p rob lem. M i l t o n R o y C o m p a n y , M a n u f a c t u r i n g Eng inee r s , 1300 E a s t Mermaid L a n e , Phi lade lphia 18, P a .

Write today for application data on Controlled Volume Pumps in: Paper M a k i n g (Bul le t in 455) I n d u s t r i a l W a t e r T r e a t i n g (Bulletin 953) Process I n s t r u m e n t a t i o n (Bullet in 1253)

/ W / / f O i » ^ΪΖ>Ψ

TUESDAY

Section A

C Η Ε M l C Â l F Ε ED S YST E M S

Engineering Representatives in the United States, Canada, Mexico, Europe, Asia, South America and Africa.

"*&£?

Intrinsic Colloids HENRY CRESPL, ROBEBT A. UPHAUS.

JOSEPH J. KATZ. Behavior of Fibrous Proteins in Nonaqueous Solvents.

B. ROGER RAY, LEROY G. AUGEXSTINE. Trypsin Monolayers at the Water-Air In­terface. 1. Film Characteristics and the Recovery of Enzymatic Activity.

HAROLD VAN KLEY, MARK A. STAH-MANN. Electrophoresis of Polypeptidyi Proteins.

MASATTAM TAKEDA, TYUICHI ENDO. The Viscosity of Extremely Diluted Poly-( vinylchloride) Solution.

JOHN G. BUZZELL, CHARLES TANFORD. The Effect of Charge and Ionic Strength on the Viscosity of Ribonuclease.

WILFRED H. WARD, JOHN J. BARTULO-VICH. Molecular Kinetic and Chemical Properties of Wood Cortical Cell Frac­tions.

RODES TRAUTMAN. Operating and Comparating Procedures Facilitating Schlieren Pattern Analysis in Analytical Ultraceotrifugation.

ORMOND V. BRODY, J. L. ONCLEY. Microelectrophoretic Studies on Human Erythrocytes.

G. E. BOYD, G. E. MEYERS. Ionic In­teractions in Organic Ion Exchangers.

Section Β

Ion Exchange Membranes M. GOTTLIEB, R. NEIHOF, K. SOLLNER.

Preparation and Properties of Strong Base Type Collodion Matrix Membranes.

H. P. GREGOR, R. C. SHAIR, D. M. W E T -STONE, H. JACOBSON. Interpolymer Membranes. I. Preparation and Char­acterization of Polystyrenesulfonic Acid-Dynel Membranes.

H. P . GREGOR, D. M. WETSTONE. In­terpolymer Membranes. III. Prepara­tion arid Characterization of Quaternary' Ammonium Anion Selective Membranes.

S. NISHIGAKI, C. E. MARSHALL. Im­provements in the Preparation of Clay Membrane Klectrodes.

R. N E I H O F , K. SOLLNER. The Tem­porary Overshooting of Final Equilibrium Concentrations in Membrane Systems Which Drift Toward the Gibbs-Donnan Membrane Equilibrium.

C. W . CARR. The Determination of Sodium and Potassium Ion Activities in the Presence of Divalent Cations with the Use of Collodion Membrane Electrodes.

J. G. MCKELVEY, JR., K. S. SPIEGLER, M. R. J. WYLLIE. Note on the Salt Filter­ing Action of Ion Exchange Membranes.

R. J . STEWART, W. F. GRAYDON. Ion Exchange Membranes: Water Transport.

V. J. FRILETTE. Electrogravitational Transport Phenomena at Ion Exchange Membrane Surfaces.

C. E . REID, E. J. BRETON, JR. Water and Ion Flow Through Cellulose Acetate Membranes.

N. W. ROSENBERG, C. E. TERRELL. Limiting Currents in Membrane Cells.

R. KUNIN. Uranium Separations with Ion Exchange Membranes.

2 4 3 0 C & E N M A Y 14, 1956

MM;

No matter how you do it, get word to Morton for help in solving any salt problem

The Morton Salt Company offers fast help from salt specialists—at no cost to you. You get the best pcssible help when we dispatch a Morton Consulting Engi­neer in your area to your plant. He's an expert when i t comes to solving problems relating to salt—and he's backed by the services of chemists and salt scientists a t Morton's ultra-modern salt research laboratory.

A Morton Consulting Engineer can help you de­termine which grade, or grades, of salt will do the best, most economical job in your particular opera­tion. He can help you expand or modernize a brine installation or plan a new water softening system. Best of all, these services don't cost you a cent— and they may well save you hundreds of dollars.

Whatever your salt needs are, Morton can fill them promptly and economically. Morton produces

many grades of salt for use by the chemical industry. Only Mor ton has nine strategically Located plants to serve you. And only Morton can offer fast delivery from a. bag to a trainload, at favorable prices and freight;, anywhere in the country.

Sending distress signals from a mountain top is advisable only if you're steeped in the cade of the hills. The best way to get help, of course, is to write or taire.

M O R T O N S A L T C O M P A N Y

I N D U S T R I A L · D I V I S I O N

Dep>t.CEN-5, 12U So. L a Sal le Street, Ch icago 3, I l l inois

MAY I 4, I 9 5 6 C&EN 2 4 3 1

FROM ENGINE TO "INJUN"..

RCI phenol- formaldehyde r e s i n s -permit fast curing of shell molds for intricate engine parts; help create long-lasting battery separators; serve as efficient, economical binders for fibrous glass hood insulation and the brake linings required to control today's higher horse­powers. (And top quality RCI phenol goes into important engine oil additives.)

@ RCI sur face coating resins—include alkyd resins for superior automotive finishes and polyvinyl acetate emulsions for durable exterior masonry paints.

@ RCI polyester res ins — combine with diisocyanate to produce polyurethane foams (cur­rently being considered for auto seat cushions) ; permit fast production and uniform results in such reinforced plastics products as sturdy boat hulls and water skis.

fjjl RCI pure amd m o d i f i e d p h e n o l i c r e s i n s — make auto waxes and polishes harder and longer-lived.

€ 1 R C I p e n t a o h l o r o p h e n o l — is an import­ant ingredient in easily-applied preservatives for wood. It helps make wood exposed to weather last for many years.

R C I u r e a - f o r m a l d e h y d e res ins — add wet strength to paper "windshield towels."

R C I e s t e r g u m s — constitute the base for many of today's bubble gums; are also used in leather adhesives.

The next time you have a supply problem (or a technical problem), take a look at RCI. See where fast delivery of these quality-controlled RCI ma­terials (or any of those listed with our signature) can help you.

€*

m

Which of these materials do you need? Call RCI!

ÏVIALE1C A N H Y D R I D E - R e î c h h o l d p roduces and sel ls th is i m p o r t a n t bas ic chemica l ; and uses it in mak ing P O L Y U T E po lyes te r res ins . Here R C I o p e r a t o r c h e c k s ma in con t ro l s in m a l e i c p lan t .

P L A S T I C B E A U T Y — R C I P O L Y L I T E p o l y e s t e r res in is used to bu i ld t he re in forced p las t ic hu l l of a h igh -speed ou tboard four teen feet long. Th is u l t ra m o d e r n c ra f t we ighs on ly 3 5 0 pounds .

Creative Chemistry . „ . Your Partner

in Progress Synthetic Resins · Chemical Colors * Industrial Adhesives · Plasticizers

Phenol · Formaldehyde · Glycerine · Phthalic Anhydride Maleic Anhydride · Sodium Sulfite · Pentaerythritol · Pentachlorophenol

REICHHOLD CHEMICALS. INC., RCI BUILDING, WHITE PLAINS. Ν. Υ.

... RCI is in the Picture!

REICHHOLD

This simplified drawing of a n experimental homogeneous type power reactor, n o w in the f inal assembly stage, shows one of five nuclear reactor projects currently under w a y a t Los Alamos, where the world's first ho­mogeneous reactor was designed a n d built and is still in operation.

Indicative of the importance of these experi­ments is the Laboratory's thirteen y e a r record in active research, design a n d development in this major field of basic scientific interest

M a n y challenging projects in nucleonics, physics, chemistry, metallurgy, mathematics and engineering support these as w e l l as other of the Laboratory's diverse activities.

Top-level scientists and engineers interested in long-range career opportunities a t one of the nation's foremost scientific labora­tories can secure complete information by writing

DEPARTMENT OF SCIENTIFIC PERSONNEL Division 901

alamos scientific laboratory

THE UNIVERSITY OF CALIFORNIA * LOS ALAMOS, NEW MEXICO

ASSOCIATIONS

WEDNESDAY

Section A

Surfaces and Interfaces FRED L. PUNDSACK, GEORGB REIM-

SCHXTSSEL. The Properties of Asbestos. III. Basic Characteristics of Chrysotile Suspensions.

V. E. NASH, C. E. MARSHALL. Cationic Reactions of Feldspar Surfaces.

JAMES T. RICHARDSON, W. O. MILLI-GAN. Magnetic Susceptibility Studies in the System: NiO-ALOs.

H. S. RITTER, GERALD CORSARO. Elec-trophoretic Properties of Amorphous Silica Particles -

R. G. CRAIG, J. J . VAN VOORHIS, F . E. BARTELL. Free Energy of Immersion of Compressed Powders with Different Liquids. I. Graphite Powder.

L. S. BARTELL, R. J. RXJCH. The Wet­ting of Incomplete Monomolecular Layers.

W. M. SAWYER, F . M. FOWKES. Mono­layers in EquHibriurn with Lenses of Oil on Water. I . Octadecanal and Tetra-decanoic Acid in White Oil.

Association Colloids DAVID B. LXJDLTJAI. Micelle Formation

in Solutions of Isomeric Detergents. H. B. KLEVENS, C. W. CARR. Equi­

librium Dialysis of Soap and Detergent Solutions.

Β. Μ. Ε. VAN DER HOFJF. On the Mechanism of the Emulsion Polymeriza­tion of Styrene.

SYDNEY ROSS, J. N. BUTLER. The In­hibition of FOaming. VII. Effects of Antifoaming Agents on Surface-Plastic Solutions.

Section Β

Diffusion in Liquids and Polymers (In Participation Λνίτΐι Division of High Poly­mer Physics of American Physical Society )

JOHN G. KIRBZWOOD. Equations of Transport in MuMcomponent Systems.

GERSON KJEGELES. Optical Methods for Studying Diffusion in Liquids.

L. G. LOÎSTGSWORTH. Soret Diffusion with the Aid of Rayleigh Interferometry.

Louis J. GOSTING. The Determination of Diffusion Coefficients for Liquid Sys­tems by Measurements of Free Diffusion.

HENRY EYRING, RANSOM: B. PARLIN. The Permeability of Membranes.

R. M. BA^RRER. Some Properties of Diffusion Coefficients in Polymers.

M. SZWARC, V. STANNETT. Some Aspects of the Permeation of Vapors Through Polymer Films.

F. A. LONG. Influence of the Glass Transition on Diffusion in Polymers.

Division of High Polymer Physics, American Physical Society

WEDNESDAY

Diffusion in Liquids and Polymers ( In Participation with 30th Colloid Symposium of ACS—see above)

2 4 3 4 C & E N M A Y 14, 1 9 5 6

lo s

KEY 1. Critical Regiqn- · 2. Heat Exchanger 3. f u m p Impeller

THURSDAY

Flow Processes in Polymers C. F . CURTISS. Statistical Mechanics

and Thermodynamics of Flow Processes. JOHN D. FERRY. Characteristic Phe­

nomena Associated with Flow Processes in Polymers.

F. BTJECHE. Molecular Entanglements and Their Effect on Viscous and Elastic Deformation of Polymers.

S. GRATCH. The Elementary Process of Flow.

B. ZI:MM. Details of Flow Processes in Dilute Polymer Solutions.

L. MANDEJLKERN. Correlation Between the Flow Behavior of a Polymer Molecule in Dilute Solution and in Bulk.

Symposium on Valency and Chemical Bonding (ACS Division of Physical and Inorganic Chemistry and Division of Chemical Physics, American Physical Society)

WEDNESDAY

HENRY EYRING. Valence in the Acti­vated Complex.

ROBERT S. MUTXIKEN. Some Thoughts on How to Understand Chemical Bonding.

PER OLOV LOWDIN. Quantum Me­chanical Nature of the Chemical Bond.

JOHN A. POPLE. ( T O he announced). VIRGINIA F . GRIFFXNG. Recent Ad­

vances in the Application of Molecular Orbital Theory to Atoms and Molecules.

RICHARD A. BUCKINGHAM. Almost Spherically Symmetric Molecules.

WILLIAM T. SIMPSON. Simplified Models in Molecular Quantum Mechanics.

THURSDAY

JOHN R. PLATT. Electron Densities and Chemical Bonds.

PAUL C. CROSS. Some Methods of Analysis of Rotational Fine Structure.

E. BRIGHT WILSON, JR. The Structure and Barriers Against Internal Rotation for Some Molecules Containing Methyl Groups.

DONALD F . HORNIG. ( T O be an­nounced ).

WILLIAM N. LIPSCOIMB, J R . Structure of Boron Hydrides.

WILLIAM W. BEEMAN. Molecular Structure from X-Ray Absorption Edges.

S. I. WEISSMAN. Electron Spin Reso­nance.

SIMON H. BAUER. Bond Order in BX3 Compounds as Deduced from Interatomic Distances and Bond Energies.

FRIDAY

GEORGE GLOCKLER. Bond Energies and Bond Distances.

J. L. FRANKLIN, F. H . FIELDS. Energy of Formation of Molecules and Free Radi­cals from Mass Spectroscopic Appearance Potentials.

JOHN L. MARGRAVE. Structure of Gaseous Boron Compounds from High Temperature and Mass Spectroscopic Data.

(Continued on page 2462)

M A Y 14, 1 9 5 6 C & E N 2 4 3 5

C o n s o l i d a t e d V a c u u m R o c h e s t e r 3 , Ν . Υ .

\α division of CONSOLIDATED ELECTRODYNAMICS CORPORATION, Pasadena, California

S a l e s O f f i c e s : Albuquerque · Atlanta f Boston · BuFfalo *" Chicago · Dallas · Detroit New York · Pasadena · Philadelphia · ' San Francisco · Seattle · Washington, D. C.

For complete information write for d a t a sheets No. 3 - 5 and 3-10 . / Λ

CVC laboratory centrifugal molecular stills v

separa te heat-sensitive materials with molecular weights up to 7 2 0 0 , with less d q n g e r of thermal decomposition than b y any other .method 75f~distin ation. ." : ^~~- 7~ \ - ~

Most people live a lifetime without one

BUT . . · are you one of the some who can't afford t o ~ b e " - ' •;·' • ̂ "---r-•• ••_!_.. : _ _ _ _

without ^ -=> o n e ' · '•"••

MOLECULAR STILLS .,

CHEMICALS EXCHANGE Heavy and Fine Chemicals; Natura l and Synthetic Resins; Gums,

Waxes, Oils; Pharmaceuticals, Solvents, Dyes, Pigments; for the Chemical and Process Industries

STRONTIUM LACTATE one of the many special

chemicals w e manufacture

W r i t e for c o m p l e t e l i s t i n g s

CITY CHEMICAL CORP. 1 3 2 W . 2 2 n d St. N e w York 1 1 , Ν . Υ.

CHOLESTEROL 4-C" Available for immediate delivery at

NEW LOW PRICES. Write for Data Sheet N o . 515

B E T A LABORATORIES, I N C . 205 N. 3rd St. Phila. 6, Pa.

IRON SEQUESTRATION SACCHAROL

H i g h l y E f f e c t i v e — L o w C o s t

For further information write to

-7 READING v ^ Reading, Petmo.

Pfëceis, Maintenance, Auxiliary Equipment Instruments, and Facîlttîesf foKPJarit and[Ipbôrai^rY^JnJ^^^emtcal and, Process-IgdinMeii

L A B O R A T O R Y

• f I U M 4 : l Indispensable for Research in Solids, Semi-Solids, Plas­tics, Ores, Soils, Fats, W a x e s , Ceramic, Cement , Coal a n d R u b b e r c o m p o u n d s , e t c Quick, un i form a n d c o m ­plete mixing. Easy to clean. 231 cu. in. capacity. % H .P . M o t o r . V a r i a b l e W h e e l pressure. T w o models. L o w Price. Ask for Bulletin N o . 5 .

INTERNATIONAL CLAY MACHINERY CO. (OF DELAWARE) DAYTON h OHIO

P L A S T I C S FOR S C I E N C E

POLYETHYLENE

S Y P H O N S

H A N D P U M P S

P O U R I N G S P O U T S FOR ANY DISPENSING PROBLEM

At Your Laboratory Dealer

For catalog» or made to order items, write

BEL-ART PRODUCTS 4 9 1 7 M u r p h y P l a c e , W e s t N e w Y o r k , N . J .

TANK°METER FOR MEASURING TANK CONTENTS

ANY DISTANCE A W A Y

INSTRUMENT CO. * 4 8 3 GETTY AVENUE, PATERSON.N- J .

S M J A C M E . . . the Gas Mask that gives you

MAXIMUM USABLE VISION

Write for Bulletins 541 and 561

A C M E PROTECTION EQUIP.CO. 1217 Kalamazoo Street, South Haven, Mich.

Enjoy LaMotte Process Controls for Plant Economy

FOR PHOSPHATES— POLYPHOSPHATES—pH— CHLORINE—BROMINE-

FLUORIDE—CHROMATES, ETC. Illustrated Booklet will be sent on request

LaMOTTE CHEMICAL PRODUCTS COMPANY

D e p t . C E N , T o w s o n

B a l t i m o r e 4 , M a r y l a n d

VISCOMETERS A l l A . S . T . M . sizes and many special sizes in stock.

I. II. III. rv. V. VI. VII.

C a n n o n - F e n s k e T y p e U b b e l o h d e T y p e O p a q u e T y p e C a n n o n - U b b e l o h d e T y p e S e m i - M i c r o T y p e C a n n o n - Z h u k o x T y p e D i l u t i o n T y p e

A H calibrations d o u b l e checked O u r 19 th y e a r of service.

W r i t e for bul le t in Τ 5

CANNON INSTRUMENT COMPANY Box 812 STATE COLLEGE, PA.

TURBINE AGITATORS and PROPELLERS

ALL SIZES IN STOCK o CLEVELAND MIXER

^ COMPANY P . O . B O X 197, B E D F O R D , O .

All Glass

Construction Prices and Literature

LANNING GLASS CO. 3 3 8 Q u i n c e S t . V i n e l a n d , N . J .

A S C O L U B E " S "

STOPCOCK GREASE AND.

-JOINT LUBRICANT PURE SILICONE VIRGIN BASE

FLUOROCARBON HAS BEEN ADDED TO IMPROVE . . . • Lubricity up to tO times nor­mal silicose grease · Kelps pre­vent stopcock joint and plug seizure (freezing) · High molecu­lar «eight General Electric sili­cone base prevents reaction con­tamination · A low vapor pres­sure (less than 10-*ra.ro. Hg) in­dicates ideal suitability for high vacuum use. Operating range —40° C. to 200° C. · Costs a lot more to prepare, sells for only a Utile more.

ONLY SU5 PER 2 OZ. JAR

Arthur F. Smith Co, ·• Rochester 3 , Ν. Υ.

BOOKS (Continued from page 2460)

Soil and Soil-Aggregate Stabilization. Highway Research Board Bulletin 108. 175 pages. National Academy of Sciences—National Research Council, Washington, D . C. 1956. $3.00.

Based on a symposium presented at the 34th annual meeting, Jan. 11 to 14, 1955.

ASTM Standards on Textile Materials. Prepared b y ASTM Committee D-13 on Textile Materials, xviii + 766 pages. American Society for Testing Materials, 1916 Race St., Philadelphia 3 , Pa. 1956. §5.75.

American and Foreign Periodicals in the Fields of Physical and Natural Sciences Including Biology and Medicine. 176 pages. Walter J. Johnson, 125 East 23rd St., N e w York 10, Ν . Υ. 1955.

ASSOCIATIONS (Continued from page 2435)

MICHAEL SZWARC. T h e Nature of Bonds Between Radicals and Aromatic Hydrocarbons.

HENRY T A U B E . Hydration of Cations. R. E. RTJNTDLE. Electron Deficient Com­

pounds. F. A. COTTON. Chemistry, Structure,

Bonding, and Properties of the Metal Sandwich Compounds.

JOHN E. W E R T Z . Bonding Inferences from Nuclear Spin Resonance.

2462 C&EN M A Y 14. 1956

FfïlJIPMPWT M«I?T