IT'S HERE . .
MANUFACTURERS' LITERATURE ELECTRONIC DIGITAL INTEGRATOR Ultrafiltration catalog, 28 p, compre hensive information on membranes and equipment for concentration, desalting, fractionation of macromolecular solu tions and colloidal suspensions. In cludes selection guide and prices. Amicon. 617-861-9600 451 Oxygen analyzers, 4-p brochures de scribe industrial and flue gas instru ments; operating principles and appli cations are given. Taylor-Analytical Instrument Div. 716-235-5000 452 Interference microscope H / I , 4-p bro chure describes instrument for non destructive, no-contact thin-film thick ness and surface finish evaluation. Op eration is based on Michelson two-beam interferometry. Hacker Instruments, Inc. 201-226-8450 453
. . . the 3He/4He Dilution Refriger ator system by Cryogenic Associates . . . tested, proven and licensed* . . . a superior performer in the field.
Temperature/humidity control, 28-p catalog describes full company line of controlled temperature/humidity equipment from bench top to walk-in. HotpackCorp. 215-333-1700 454
The complete modular system de livers continuous externally meas ured sample temperatures as low as 0.020° K. Heat extraction capability (also measured externally) is as large as 1000 erg/sec. at 0.1° Κ and 120 erg/sec. at 0.040° K.
Glassware and apparatus, Catalog 600, 407 pages, includes new sections on photochemical equipment and no-air glassware and an expanded section on environmental glassware. Write on letterhead to Ace Glass, Inc., P.O. Box 688, Vineland, N.J. 08360
There's more! The versatility of de sign allows individual components to be matched to specific needs. Sev eral optional devices make it even more interesting.
Minicomputer interface, 6-p folder de scribes the use of the 801E in PDP-8 family systems. Cost is only $1250 complete. Heath/Schlumberger Scien tific Instruments. 616-983-3897 4 5 5
Complete specifications are yours on request. One look and you'll easily determine that Cryogenic Associ ates' Dilution Refrigerator is the answer for Mossbauer Effect Spectroscopy/Polarized Targets for Nu c l e a r and E l e m e n t a r y P a r t i c l e Physics/Quantum Liquids/Super conductivity/Thermal Transport Properties of Solids/Kondo Effect/ Nuclear Demagnetization.
ATR spectra, 16-p booklet on how to optimize ATR spectra with variable angle techniques includes charts and eranhs. Barnes Eneineerine Co. 203graphs 456 348-5381
CA
". . . lor the finest in Cryogenic Systems" 1718 North Luett Avenue Indianapolis, Indiana 46222 Phone: (317) 632-2515 u n d e r U.S. Pat. No.
CIRCLE 3 4 O N READER SERVICE CARD
For a limited time you can get an electronic digital integrator for only t w i c e the price of an equivalent ISCO model. This offer is available from any other integrator manufac turer—just tell them you want an instrument with these specifications, and ask for their quotation. 1 second to 2 hour peak duration capability 50,000 counts per second resolution 5 digit area printout Retention time printout Automatic baseline tracking Buffer storage register Automatic noise filtering Automatic peak shape optimization Manual peak sensitivity selection The ISCO Model 950 has these and other features suitable for gas chro matography, standard and high speed liquid chromatography and other applications. It is priced under $2,000, and is described in our cur rent general catalog. Send for your copy today.
Polychlorinated biphenyls, July, 16-p issue of Research Notes contains an article with 85 references on PCB's in the environment and their analysis. The company has available 99% pure PCB isomers and other reference stan dards for pollutants. Analabs, Inc., 80 Republic Dr., North Haven, Conn. 06473
CRYOGENIC ASSOCIATES INC.
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Air pollution apparatus, 8-p brochure of products, such as bubblers, impingers, sampling cyclone, adapters, gas washing bottles, and collection tubes for air pollution labs. Wheaton Scien tific. 609-825-1400 457
model 950
ISCO
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BOX 5347 LINCOLN, NEBRASKA 68505 PHONE (402) 434-0231 TELEX 48-6453 CIRCLE 1 1 0 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 44, NO. 12, OCTOBER 1972 ·
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