MANUFACTURERS' LITERATURE Chart Drives. Three-page publication presents tentative SAMA standards for mechanical chart drives. Scientific Apparatus Makers Assoc. (BC 11-51965). 52 Raman Spectrophotometer. Sixteenpage bulletin on Cary Model 81 Raman spectrophotometer describes its per formance and includes schematic dia gram and several spectrograms. Ap plied Physics Corp. 53 Diamond Chlorowax. Thirty-sixpage reference manual lists resinous and liquid grades available, and reviews principal industrial applications for this chlorinated paraffin; includes informa tion as to characteristics and physical properties. Diamond Alkali Co. 54 Cambridge Surface Pyrometers are light weight, portable instruments — accurate but rugged — for measuring temperature of mold cavities and flat surfaces, still or moving rolls, and within-the-mass temperature of materials in a plastic or semi-plastic state. Write for Bulletin 194-SA; 33 illustrations, many applications.
CAMBRIDGE INSTRUMENT CO., INC. 3514 Grand Central Terminal, New York 17
PIONEER
MANUFACTURERS
OF
PRECISION
INSTRUMENTS
For further information, circle number 92 A-1 on Readers' Service Card, page 69 A
Preferred
by
Nobel Prize Winners !
Mercury Diffusion Pumps by
Wakefield
. . . developed by Van Hespen of the University of Chicago, this two-stage pump is preferred by top scientists for high vacuum work because . . . t h e g a s i n t a k e is 2 0 liters per second the d e s i g n provides m a x i m u m performance and reliability with minimum attention. the pump takes hold at 8 - 1 0 m m fore pressure with ultimate pressure of Ι Ο ' 6 m m . Write Dept. 3 5 6 For further i n f o r m a t i o n write: 5 1 0 8 W . G R O V E ST., SKOKIE
(Chicago)
ILLINOIS
WAKEFIELD INDUSTRIES, INC.
For further information, circle number 82 A-2 on Readers' Service Card, page 69 A
82 A
Trimethylolethane. Technical bulle tin details advantages of TME in com parison with other triols and reports on use of TME in manufacture of alkyds, describing properties and giving typical formulations. Heyden Chemical Corp. 55 X-Ray Protective Equipment. Bro chure describes x-ray and gamma ray protective equipment and materials for industrial, hospital, clinic,· laboratory, and institutional uses of x-ray and radio isotope devices. Ameray Corp. 56 Light
Scattering
Photometer.
Twenty-four page catalog gives general d e s c r i p t i o n of new light scattering photometer for determining high molec ular weights and small particle size and includes listing of standard accessories and parts. Phoenix Precision Instru ment Co. {Bull. B-P1000 A). 57 Electrophoresis Apparatus. Twopage bulletin describes features, per formance, and construction of rede signed apparatus for paper strip electrophoresis, discussing ionographic studies which may be performed. Pre cision Scientific Co. (Bull. 690A). 58 Chromatographic Analysis Appara tus. Illustrated data sheet describes filter paper chromatopile and discusses wide range of applications, features, con struction, and operation. Precision Scientific Co. (Data Sheet 11193). 59 Counters and Control Instruments.
Four-page bulletin describes line of instruments for counting continuous, discontinuous, or cyclic succession of events, linear or liquid flow, and any range up to 100 million, with counting speeds up to 20,000 events per second and higher. Atomic Instrument Co. 60 For further infonnation, see coupon on page 69 A ANALYTICAL
CHEMISTRY
