Varian STRIP CHART Recorders
Product Capsules Pumps. Circle 27A for bulletin on model 75 v a c u u m p u m p . 75 liters p e r minute. Vacuum to 0.1 micron. C o m pact, portable. Precision Scientific Co., 3725 W . Cortland St., Chicago 47, 111. 27A
CATHODE-RAY POLAROGRAPHY
Pumps. Circle 85A-2 for folder on centrifugal and posith-e pressure p u m p s and variable speed stirrers. E a s t e r n Industries, Inc., 100 Skiff St., H a m d e n , Conn. 85A-2 Radioactive Analysis Instruments. Circle 8A for a technical description of procedures used in mixing evaluation b y radioisotopic analysis. NuclearChicago Corp., 251 W . Erie St., Chi cago 10, 111. 8A Radioactive Analysis Instruments. Circle indicated numbers for instru m e n t s t h a t provide t h e following: p r e cision pulse height analysis, 20A-1 ; reliable scaling, 20A-2; power source for scintillation counters, 20A-3 ; com plete recording spectrometer system, 20A-4; a n d liquid phosphor "soft b e t a " counting, 20A-5. Technical Measure m e n t Corp., 441 Washington Ave., N . H a v e n , Conn. 20A-T t o 5
Unique combination of performance, size and price OVER 1000 TIMES AS SENSITIVE as galva nometer recorders... and Varian's nullbalance potentiometer needs no power from the source being measured. Rugged, stable mechanism allows ink or inkless recording-easy-to-read rectilinear c h a r t source impedances of up to 100,000 ohms. LESS THAN HALF AS WIDE as a standard 19-inch rack. Two Varian G-llA's mount side by side on a rack panel 10% inches high. Or as a portable, the G-11A is an easy-to-handle 15 pounds. The G-10 sits on less than one square foot; its horizon tal chart is handy for jotting notes. MORE VERSATILE AND ADAPTABLE than any similar recorder — adjustable zero, adjustable span (from 9 tq.100 mv on the G-11A), multiple chart speeds (up to four on the G-11A), and plug-in input chassis for different recording requirements. PRICES THAT BEGIN AT $340 for the G-10 and $450 for the G-11A. Because unneeded performance costs money, Varian has intentionally designed for 1 % limit of error and 1-second balancing time. Thus, Varian provides needed ruggedness, dependability and operating fea tures at moderate cost. WRITE TODAY FOR COMPLETE SPECIFICATIONS AND STANDARD OPTIONS
VARIAN
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Refrigerated Freeze-Mobile Unit. Self-contained, all purpose unit with in frared heaters, condenser, vacuum d r u m , p u m p and gauge, and mechan ically refrigerated unit. Automatically refrigerated as low as —60° C. Scien tific Products, D i v . of American Hos pital Supply Corp., 1210 Leon Place, E v a n s t o n , 111. 91A S a f e t y Enclosures. Circle 95A-1 for illustrated folder describing 22 differ ent kinds of safety enclosures for han dling hazardous substances. S. Blickm a n , Inc., 9612 Gregory Ave., Weehawken, N . J. 85A-1 Spectrographic Equipment. Informa tion available from t h e combined facili ties of Bausch & L o m b and Applied Research Laboratories on a most com plete line of spectrographic equipment and service. Includes 24 B&L instru ments. Bausch & L o m b Optical Co., 60936 St. Paul St., Rochester 2, Ν . Υ. OBC
Spectrographic Sample Grinders. T h e " W i g - L - B u g " provides fast, homo CALIFORNIA geneous, reproducible grinding of sam-
Circle No. 98-1 on Readers Service Card, page 89 A 98 A
Radioactive Analysis Instruments. W i t h complete systems for p r o p o r tional, scintillation a n d geiger counting, t h e "University Series" instrument handles alpha, beta, gamma, a n d x-rays. Circle 44A for info. Baird-Atomic, Inc., 33 University Rd., Cambridge 38, Mass. 44A
ANALYTICAL CHEMISTRY
THE POLAROTRACE presents t h e results instantaneously o n t h e s c r e e n i n t h e f o r m of a p e a k e d polarogram. * Speedy, direct or derivative operation. * Direct reading from scale eliminates geometrical construction. * Greater resolution due to formation of Peaked Polarograms. * Polarograms reproduced every seven seconds. * Increased sensitivity enables accurate determinations at concentrations of fractions of a microgram per millilitre.
with the POLAROTRACE* you have the ultimate in Polarographic technique, without undue c o m p l e x ^ of control. Suitable for research or routine, it is supplied complete with its Electrode Stand, which includes a thermostaticallycontrolled tank. Camera attachments are also avail able. *TRADE MARK
Write for our brochure 101 and advice on your own problem SOUTHERN I N S T R U M E N T S COMPUTER D I V I S I O N CAMBERLEY, SURREY, ENGLAND
Agents in all major countries. U.S.A. enquiries to sole distributors STANDARD SCIENTIFIC SUPPLY CORP. 808 Broadway, New York 3
sindak E Q U I P M E N T FOR C A L C U L A T I O N AND ANALYSIS Circle No. 98-2 on Readers' Service Card, page 89 A
