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MOISTURE
Miniature Cryogenerator This device with a base 3 " square and measuring only 12" high maintains effective refrigeration at any level from room temperature down to —400° F. The Cryogenerator can be used to cool infrared detectors, parametric amplifi ers and other low-noise electronic equipment. North American Philips Co., Ashton, R. I. 408
coNrercr in fibers, grains, semi-liquids, or
solids...
DIETERT-DETROIT
MOISTURE TELLER Quickly and accurately determines moisture content of any material. Test is direct. No chemicals or in volved computation required. Widely used in industry for re search, analysis and quality control of foodstuffs, chemicals, fibers, foundry sands, soaps, ceramics and many other materials. Complete range of models available.
H A R R Y W. DIETERT CO. CONTROL EQUIPMENT 9330 R o s e l a w n · D e t r o i t 4, M i c h . Send me your Moisture Teller catalog with prices. Name Address Company .State.
City
Circle No. 45 on Readers' Service Card 116 A
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ANALYTICAL CHEMISTRY
High vacuum, low temperature rotary evaporator is constructed so that vapor contacts only Teflon and glass assuring uncontaminated yields. Greaseless vacuum seal holds 0.1 mm. vacuum while flask and shaft ro tate. Unit can be used for batch op erations or continuously. Model C. California Laboratory Equipment Co., 1717 Fifth St., Berkeley 10, Calif. 409
Oscillating Pump Liquid pump for intermittent duty has a coil in place of the usual motor and operates on either 50 or 60 cycle, 115 volt, single phase current. The armature acts against a spring and by using a diode in the circuit causes 3600 oscillations per minute on 60 cycle cur rent. Inside the armature is a Hypalon rubber sleeve which incorporates a small automatic check valve which opens and closes with each oscillation. The unit is self-priming and will pump 1 qt. per min. at a two-ft. head with continuous flow. Gorman-Rupp In dustries, Inc., Bellville, Ohio. 410
Ace Scientific Supply Co. Linden, N. J. Aloe Scientific Co. Kansas City, Mo. Amend Drug & Chemical Co., Inc. New York, Ν. Υ. Analytical Engineering Laboratories, Inc. Hamden, Conn. Applied Science Laboratories State College, Pa. Central Scientific Co. Chicago, Illinois LaPine Scientific Co. Berkeley, Calif. LaPine Scientific Co. Chicago, III. LaPine Scientific Co. of Ν. Υ. Irvington-on-Hudson A. S. Aloe Co. St. Louis, Mo. Beckman Instruments Co. Fullerton, Calif. Braun Chemical Co. Los Angeles, Calif. Braun-Knecht-Heimann San Francisco, Calif. Burrell Corp. Pittsburgh, Pa. W. H. Curtin Co. Houston, Texas Chrom-Line Laboratories Kansas City, Mo. Curtis & French, Inc. Indianapolis, Ind. Distanal, Inc. Baton Rouge, La. Eberbach & Sons, Co. Ann Arbor, Michigan F & M Scientific Corp. Avondale, Pa. Fisher Scientific Co. All offices Green Briar Instrument Co. Ronceverte, W. Va. Emil Greiner New York, Ν. Υ. General Laboratory Supply Co. Paterson, N. J. Harshaw Chemical Co. All offices Jarrell-Ash Co. Newtonville, Mass. Lachat Chemicals, Inc. Chicago, III. Loe Engineering Co. Atladena, Calif. Metro Industries Long Island City, Ν. Υ. Nester & Faust Newar, Delaware Perkin-Elmer Corp. Norwalk, Conn. Phipps & Bird, Inc. Richmond, Va. Podbleiniak, Inc. Chicago, III. Precision Scientific Co. Chicago 47, III. B. Preiser Co. Inc. Charleston, W. Va. Research Specialties Co. Richmond, California Ε. Η. Sargent Co. All offices Scientific Glass Apparatus Co. Bloomfield, N. J. Scientific Products South San Francisco, Calif. Scientific Supplies Co. Seattle, Wash. Shamrock Specialties Co. Texas City, Texas Arthur H. Thomas Co. Philadelphia, Pa. George T. Walker Co. Minneapolis, Minn. Wilkens Inst. & Res. Co. Berkeley, Calif. Walnut Creek, Calif. Consolidated Electrodynamics Pasadena, Calif. Chemical Research Services Inc. Addison, II IN CANADA Canadian Johns-Manville Co., Ltd Montreal, P.O. Port Credit (Toronto), Ontario Harrison and Crosfield (Canada) Ltd. Winnipeg, Manitoba Other Principal Cities
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