NEW PRODUCTS, continued lished for any container, all future tests can be run by merely setting the current at the same value, resulting in close con trol of the rate of temperature rise. The heat source has a 12-inch-square work surface, a support rod, and a light source. I t is rated at 500 watts. 22
Operation consists of placing an ounce sample in the unit and cooling it to its freezing point with an ether-air mixture. Rate of air flow is controlled by a knob on the front panel. The dial of the cryoscope is marked to read di rectly in terms of percentage water. 2 4
API Standard Compounds Now available as American Petroleum Institute Standard hydrocarbon samples are: 3-methyl-irans-3-hexene, 3-ethyl1-pentene, ethenylcyclopentane. They are furnished in 5-ml. quantities sealed in a borosilicate glass ampoule with an internal break-off tip. 23 Hortvet Cryoscope Fisher Scientific Co. has redesigned its Hortvet cryoscope for more convenient determinations of water in milk. Two elements of the analysis—stirring and ether vaporization—have been mecha nized. The milk sample is gently stirred in a steady up-and-down motion at the rate of one stroke per 2 seconds, as specified by the Association of Official Agricultural Chemists. Air for evapo rating the ether is supplied by a small electrically driven pump mounted in the instrument case. A collecting tube for ether fumes is also furnished.
MANUFACTURERS' LITERATURE Gas Analyzers. Four-page data sheet describes applications and operation of nondispersion infrared instruments for continuous analysis and control of heteroatomic gases. MinneapolisHoneywell Regulator Co. (Data Sheet 10.15-10). 25 Infrared Spectrometer. Specifications and performance information for singlebeam instrument for routine quality control presented in 6-page brochure. The Perkin-Elmer Corp. {Model 12-C). 26 Polyethylene Ware. Four-page folder lists prices of polyethylene laboratory items offered by E. Machlett & Son. 2 7 Gold Analysis. Procedures for the analysis of gold and gold alloy solutions
QUICK HELP on special apparatus problems
Whether it's simple or complex, you can count on Corning technicians to design and fabricate special laboratory glassware quickly and at modest cost. Made by men who know glass from start to finish, there isn't any problem that can't be solved to your satisfaction. In most cases, PYREX brand glass No. 7740 gives you all the properties required for long service life . . . exceptional heat resistance, chemical stability and mechanical strength. But if you need something special in glass, too, Corning has it . . . like VYCOR brand glass No. 7900, a 96% silica glass with a temperature limit well above PYREX brand glass No. 7740. Your requests will receive prompt attention. Call your laboratory dealer or write direct to Corning, Ν. Υ. C O R N I N G GLASS WORKS · C O R N I N G , Ν. Υ.
are discussed in a reprint of 6 pages. Technic, Inc. 28 Testing Equipment. First issue of 4page company periodical describes test ing instruments and laboratory equip ment available from Gardner Labora tory, Inc. (Newsletter). 29 Methylene Iodide. One-page sheet gives properties and applications of pure material for testing minerals, glasses, and gems and for organic synthesis. National Biochemical Co. (Bull. 20). 3 0 Moisture Determination. A 29-page summary of methods and a suggested list of equipment for the determination of moisture in food products, insecti cides, and fungicides. Central Scien tific Co. (Pamphlet FM-1). 31 Reagents. Price list of 66 pages cover ing inorganic and organic analytical re agents and special analytical apparatus. G. Frederick Smith Chemical Co. 3 2 Thickness Gages. A 4-page folder tabulates specifications and applications of ultrasonic instruments for measuring thickness from one side. Branson In struments, Inc. 33 Batteries. Application guide with rotating selector disk presents technical data for selection of silver-zinc alkaline storage batteries. Yardnev Electric Corp. " 34 Ethyl Alcohol. Three-page technical data sheet gives information on avail able grades, specifications, properties, toxicity, shipping, and handling of pure and denatured ethyl alcohol. Commer cial Solvents Corp. (TDS SI). 35 Electronic Computing. Brochure of 8 pages describes analog and digital com puting facilities available for solving industrial and technical problems at Armour Research Foundation (Com puter Center). 36 Sodium Dispersions. Properties, prep aration, handling, analysis, and indus trial and laboratory applications of sus pensions of sodium in hydrocarbon mediums reviewed in 30-page booklet. U. S. Industrial Chemicals Co. 37 Balances. Folder of 4 pages describes features of line of English-made balances and microbalances distributed by Burrell Corp. (Bull. 889). " 38 Electrical Measurement. A 4-page leaflet describes multirange a.c. and d.c. current and voltage measuring instru ment and its operation. Sensitive Re search Instrument Corp. (Universal 88). 39 For further information, see coupon on page 37 A
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