NEW PRODUCTS—LABWARE A N D Laboratory Equipment
INSTRUMENTS Conductivity meter (Model C M - 1 ) . Linear range from 0.01 to 1000 micromhos; linear to within ± 0 . 5 % of full scale on all of seven selectable ranges; accuracy is ± 1 % of full scale at the recorder output and ± 2 % of full scale on the panel meter. Chromatronix, Inc., San Francisco, Calif. Ε 37
High voltage source (Model 152 Coronatrol). Source of con trollable d.c. high voltage suitable for use in laboratory or sys tem where stable source of up to ± 1 0 kv. at currents to 1 Milliamp. may be needed; features three distinct modes of amplifier, power supply, controller. Monroe Electronics, Inc., Middleport, N.Y. Ε 30
Atomic absorption spectrophotometer ( E E L Model 2 4 0 ) . Designed to perform both research and routine problems in atomic absorption and flame emission; compact 100-pound unit; carrier gas may be air, nitrous oxide, or argon; fuel may be acetylene or hydrogen; automatic flame ignition is provided; de signed to reduce noise levels. Evans International, Inc., Hacldonfield, N.J. Ε 38
Miniature torch. Gives needle-point flame for precision weld ing of metals smaller than 0.002-inch wire and up to 16-gage steel; uses oxygen and a fuel gas (acetylene, hydrogen, LP-gas, or natural gas) to produce flame temperatures to 6300° F.; equipped with five different sized tips which swivel 360°; tips have jeweled orifices to prevent oxide contamination in the joint. Tescom Corp., Minneapolis, Minn. Ε 31
Literature
Electrobalance (Cahn D T L Millibalance ). Top-loading; weighs samples down to 0.01 mg.; equipped with digital volt meter for direct visual display of sample weight; weighing 20 to 30 samples per minute is possible; normal capacity of 10 grams, including 9 grams of tare; protected against accidental overload of up to 300 grams. Ventron Instruments, Paramount, Calif. Ε 32
Nuclear and x-ray accessories (Catalog 7 0 ) . Describes prod ucts required by users of radioisotopes and x-rays; includes health physics equipment, nuclear medicine accessories, liquid scintillation materials, lab supplies, radiation detectors, x-ray monitoring equipment, ultrasonic cleaners, personal radiation monitors. Nuclear Associates, Inc., Westbury, N.Y. L1 Thermogravimetry and differential thermal analysis (Bulletin M2022). Reviews new applications of these techniques to the testing of explosives and solid propellant ingredients; decom position kinetics and phase changes of pseudo-stable solids are discussed; experimental technique examined with emphasis on sample preparation, atmosphere control, particle size; radiation damage studies included. Mettler Instrument Corp., Princeton, N.J. L2
Demineralizer ( Deeminizer ). Compact, portable unit demineralizes water and checks purity; equipped with ohmmeter indi cating specific resistance in megohms; also indicates sodium chloride in parts per million; cartridges are specifically formu lated mixed beds of strong anionic and cationic exchange resins; gravity flow at rate of 6 to 7 g.p.h. Crystalab, Hartford, Conn. Ε 33 Micro syringes (Models 19905 and 19913). Removable needle models in 10-, 20,- and 50-microliter sizes with 24- or 26-gage screw hub type needles in lengths up to 6 inches. Glenco Sci entific, Inc., Houston, Tex. Ε 34
Volta m metric stripping analysis booklet. Describes electroanalytical technique for detecting 1 p.p.b. in trace analysis; covers what can be determined and measured, advantages of stripping analysis, typical examples, types of electrodes, cell electrode systems, readout systems, instrumentation. Chemtrix, Inc., Beaverton, Ore. L3
Instruments Bath control (Model 5 1 ) . For lab baths and circulating sys tems; mechanical relays replaced with solid-state switches; dual power controls, one for continuous booster heater, other for a heater turned on and off by thermoregulator; range is —20° to 40° C. Fisher Scientific Co., Pittsburgh, Pa. Ε 35
Surface coating analysis booklet. Describes how to obtain meaningful infrared spectra of surface coatings by attenuated total reflectance; spectrum of unpigmented alkyd resin is re produced as a reference; details are given on how to catalog bands from pigments and fillers, illustrated with several spectra. Barnes Engineering Co., Stamford, Conn. L4
Log linear amplifier (Model LLA 130). Suitable for current measurement, monitoring on lab instruments such as photomultiplier tubes, chromatograph detectors, nuclear instruments, flame detectors; has built-in calibration signals; range is 1 χ 4 amp. American Standard, Inc., Falls 10-!0 to 1 χ 10 Ε 36 Church, Va.
Hydrogen purifier bulletin. Describes the applications, advan tages, construction, and operation of units that purify commer cial-grade hydrogen to ultrapure hydrogen by diffusion; all mod els are portable; units weigh between 9 and 14 lbs. and consume 40 to 268 watts of power; for use in analytical, research, and quality control labs. Matthey Bishop, Inc., Malvern, Pa. L 5
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