PURE MATERIALS

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Jarrell-Ash . . . as exclusive U.S. distributor for Johnson, Matthey & Co., Ltd. . . . offers you the most complete line of high-pur i ty mater ia ls for use in quant i ta t ive spectrochemical analysis and research:

METALLIC SALTS METALS — powder, foil, sponge, lump, wire, etc. RARE EARTH OXIDES ELECTRODES SOLUTIONS STANDARD SETS OF ALLOYS

Each sh ipmen t of each mate r ia l is accom­panied by a laboratory report which l ists detected impur i t i es in par ts per m i l l i on .

SPECTROGRAPHS SUPPLIES Jarrel l -Ash also carr ies in stock for your convenience: • Jarrel l -Ash S Q Powder Standards. • Kodak S p e c t r o g r a p h s F i lm, Plates.

Developers, Stop Bath, Fixers and Hardener.

• " N a t i o n a l " Electrodes, Pre-Forms, Powders.

24 HOUR SERVICE ON STOCK ITEMS

Dedicated to excel lence in research, deve lopment and manufac tu re of precis ion analy t ica l i ns t rumen ta t i on .

For cata logs . . . c l ip the coupon, a t tach to your company le t terhead and mai l .

JARRELL-ASH COMPANY I 26 Farwell Street |

Newtonville 60, Mass. N A M E .

P M

MANUFACTURERS' LITERATURE

ride Ion Analyzer. This instrument monitors the chloride ion concentra­tions in process streams in the ranges 1 to 1000, or 10 to 10,000 p.p.m. Beck-man Scientific and Process Instruments Division, 2500 Harbor Blvd., Fullerton, Calif. 631

Biological Glassware. An 8-page booklet describes five specialized glass­ware units: metabolism cages for tracer studies with small animals, Wis-treich Fat Extractor, a Chemostat, a compact Micro-Kjeldahl system, and the Auto-Qot for pipeting highly vola­tile materials. Delmar Scientific Lab­oratories, 317 Madison St., Maywood, 111. 632

Counter-Timers. A single sheet pic­tures and gives specifications for the 710 Series of solid-state 11 MC/100ns Universal Counter-Timers. Eldorado Electronics, 1832 Second St., Berkeley 10, Calif. 633

Warburg Auto-Manometer. A 4-page brochure, illustrated with photographs and diagrams, explains the instrument's capabilities for measuring any variable that is a function of pressure. Typical Warburg and non-Warburg applica­tions are listed. Mechrolab, Inc., 1060 Linda Vista Ave., Mountain View, Calif. 634

Chromatograph. A 4-page bulletin describes the capabilities of the modular 26-204 Laboratory Chromatograph. This instrument automatically pro­grams temperature with reference column accuracy from ambient to 450° C. Consolidated Electrody­namics Corp., 360 Sierra Madre Villa, Pasadena, Calif. 635

Company Periodicals Requests for copies of the following publications, catalogs, etc., should be sent directly to the address shown. Business or professional letterheads are requested.

Chemist-Analyst. Vol. 52, No. 2. The April issue includes among the articles giving various analytical procedures one on a method for inorganic micro qualitative analysis based on circular paper chromatography. The "Lab Suggestions" section gives some tips useful in thin layer and gas chroma­tography and other laboratory proce­dures. J. T. Baker Chemical Co., Phil-lipsburg, N. J.

Gas Chrom Newsletter. The Apr i l issue contains papers on the relation-

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POLYETHYLENE F A B R I C A T E D

U N B R E A K A B L E

for al l purposes What size or type of tray do you need?

Bel-Art heavy walled polyethylene trays have a multitude of uses and are a valu­able asset anywhere.

Do you need a round, square, rec­tangular, deep or shallow shape? Do you need flanges, outlets, spigots, threaded fittings, compartments or lids? What­ever your requirements we'll fabricate these trays to your specifications. No minimum quantities; we'll assemble a single tray to fit your purpose. Our facil­ities also extend to custom-made tanks, barrels, vessels, etc.

Circle No. 154 on Readers' Service Card

1 5 0 A · ANALYTICAL CHEMISTRY

Bel-Art trays of welded construction are rigid, tough, unbreakable and im­pervious to strong acids, alkalies and some solvents. In addition to regular or linear polyethylene, we also fabricate polypropylene or rigid PVC.

Sizes listed in our new catalog are representative but do not indicate size limitations. Your laboratory supply house or Bel-Art Products will be happy to quote on your special requirements.

Listed in our NEW 1963 56 page catalog. Write Dept. A.

for your FREE copy

BEL-ART PRODUCTS, P E Q U A N N O C K , N . J . O X b o w 4 - 0 5 0 0

T h e M O S T C O M P L E T E l i n e o f P l a s t i c L a b o r a t o r y W a r e a v a i l a b l e f r o m O N E s o u r c e

Circle No. 26 on Readers' Service Card

Jarrell -Ash