ratory equipment, including balance, evaporator, ovens, pipette, thermometer, and water bath. Schaar and Co. 41 Ovens. New 36-page catalog de scribes wide range of ovens, including several specifically designed for labo ratory use. Kirk & Blum Manufacturing Co. 42 Dryers. Freeze drying brochure covers Machlett line of dryers in all price ranges, including descriptions of acces sories available. E. Machlett & Son. (Bull. FD). 43 Gas Analyzer. Four-page brochure contains information on application, performance, and specifications of new R F gas analyzer. Beckman Instru ments, Inc. 44 Nitroparaffins. Technical data sheet on nitroparaffins and derivatives covers products, chemical formulas, properties, and uses. Commercial Solvents Corp. 45 Phosphating. Six-page folder de scribes line of phosphating and metal protective coating materials, and in cludes general discussion of phosphating process, as well as informative reference chart. Turco Products, Inc. 46
Explosion proof laboratory Sfittets powered by AIR These units are ideal for stirring all types of solvents, laquers, paints, oils, synthetics, fine and heavy chemicals where danger of explo sion may exist. The Arrow type G or A is a com plete unit, ready for mounting on laboratory stand. Only 25 to 1 00 lbs. of air supply is necessary. Shaft and propeller are made of stainless steel. Type G—from 100 to 1 2 0 0 ; Type A — 4 0 0 to 10,000.
Arrow E N G I N E E R I N G CO., INC. 2 0 0 Central Avenue Hillside, N. J.
Microburet Attachment. Bulletin describes construction, assembly and application of new microburet at tachment to Natelson Microgasometer. Scientific Industries, Inc. 47 Remote Metering System. Bulletin covers features and applications of simple remote metering system with "plug in" construction, employing trans ducers and electronic bridge circuit. Sparton Control Systems Division. 4 8
For further information, circle number 83 A-1 on Readers' Service Card, page 73 A
Analyse
in concentrations of 0.001 % and less Whether your problem is in research, production control, or ore assaying, you can make faster, more accurate analyses of uranium with the JAco G-M Fluorimeter. Leading mines, mills, metallurgical plants and laboratories all over the world report making 50 to 100 determinations a day — even when sample concentrations are 0.001% or lower.
Vermiculite. Sixteen-page booklet describes chemical and physical prop erties of vermiculite to assist technical and research personnel, processors, and formulators in furthering knowledge of this unusual mineral's properties and potentialities. Zonolite Co. 49 Nuclear Research. Latest issue of company magazine covers NuclearChicago's participation in Armour Re search Reactor, the nation's first pri vately owned nuclear reactor. Nuclear Instrument and Chemical Corp. 50 Reagents Star in Film. A 10-minute, 16-mm. sound-color film, called "Pre cision Tools in Bottles," is available for laboratory and classroom showings. The movie emphasizes the importance of reagent grade chemicals in today's laboratory research and industry. Fisher Scientific Co. 51 For further information, see coupon on page 73 A V O L U M E 28, NO. 10, O C T O B E R
G-M
URANIUM in any form
The JAco G-M Fluorimeter offers you the high precision sensitivity and stability you want, because its advanced design includes exclusive features:
Discover alt the ways this outstanding JAco Instrument can help you to do your job better. Write today for descriptive bulletin.
No Cooling System — Blacklight Blue lamps used as ultraviolet source require no cooling. No Optical System — sample slide, light source and detecting system are mounted in close proximity eliminating optics and allowing low voltage across dynode of the photomultiplier tube. Improved Power Source — circuit compensates for input-output voltage and tends to compensate for heater voltage variation. Convenient Control Grouping — handy keyboard arrangement of switches and controls cuts time, reduces fatigue. *S/
