NEW PRODUCTS
Geiger tubes, or alpha, beta, and gamma scintillation detectors. Two different data printing systems can be used, a count-and-time printer or a less expensive printing timer. The countand-time printer records up to 999,999 radioactivity counts and up to 999.99 minutes, and prints this information alongside the sample number. Printing is done by an electric typewriter, and the printing timer records the time required to reach the preset amount of radioactivity. Picker X-Ray Corp. P-19 Absorbance recording system, Series 200, can be used with Beckman DU, Zeiss PMQ II, and other spectrophotometers. Designed for studying enzyme catalyzed kinetic reactions in ultraviolet region, usable for kinetic reactions in other regions. It is linear with absorbance over a range of 3.0 optical density units. Gilford Instrument Laboratories, Inc. P-22
Infrared Peristaltic type constant volume pump, the Sigmamotor T-8, combined with solenoid valves and t i m i n g equipment, delivers elutant buffers into ion exchange columns on reproducible schedule. Handles one to four simultaneous pumpings; vernier adjustment gives capacities from 3 cc. per hour to 2 5 0 cc. per min. Sigmamotor, Inc. P-20
vitreosil PURE FUSED QUARTZ LABORATORY WARE OF HIGHEST PURITY
Radiometer
Model E-2D, a miniaturized filter radiometer, weighs less than three pounds and is said to be ideal for measurement of infrared radiation in certain defined spectral regions. Incoming radiation is modulated by a segmented chopping wheel, then passed through a filter to a calcium fluoride lens which focuses the radiation onto a lead sulfide detector. The detector output at the fixed frequency of the modulated radiation is amplified by a low-noise transistorized a.c. circuit with synchronous rectification to minimize system noise. This serves to isolate source radiation from spurious unmodulated energy. Block Associates, Inc. P-23
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For excellent thermal shock resistance, and inertness • For guarding the real purity of your compounds in crucibles, retorts, muffles, dishes, tanks, pots, trays • For outstanding electrical properties, strength, impermeability in ball & socket joints, standard taper joints, graded seals • Quartz to metal seals
A wide variety of laboratory ware is available in all types and sizes. Also, we fabricate to your specifications. See our ad in Chemical Engineering, Electronic Engineers Master and Electronic Designers' Catalogues. Write for complete/illustrated
catalog.
THERMAL AMERICAN FUSED QUARTZ CO., INC. 18-20 Salem Street, Dover, N e w Jene*
Circle No. 92 on Readers' Service Card
140 A
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ANALYTICAL CHEMISTRY
Single-unit ultrasonic cleaner, Model SG-2, is designed for routine cleaning of greases, gums, resins, and other clogging deposits in the laboratory. Operating frequency is 20 kc. and fluids up to 4 0 0 ° F. can be used. Tanks are equipped with screwcapped drain and are available in four sizes. Will Corp. P-21
Tungsten carbide vial and ball is said to be capable of grinding and pulverizing some of hardest known materials, with negligible contamination. Reducton is to —300 mesh or finer in two minutes. Vials have 50-ml. capacity, are used in conjunction with a Spex Mixer Mill. Kennametal, Inc. P-24
