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3. REGISTRY OF MASS SPECTRA DATA Four Volumes By the late Einar Stenhagen, Sixten Abrahamsson, University of Gdteborg, and Fred W. McLafferty, Cornell University This is the most complete and accurate source of mass spectral data ever compiled! It equips you with the best mass spectra of 18,806 different compounds arranged for quick and easy reference. Compounds are arranged by structural type as well as by molecular weight and elemental composition. 1974 3392 pages $250.00 (sold only as a set) Mail this coupon to: WILEY-INTERSCIENCE, Dept. 313 Grand Central Station, New York, N.Y. Please send me the book(s) I have checked below. D My check (money order) for $ is enclosed. G Please bill me. (Restricted to the continen tal United States.) Π Please send me a list of local bookstores carrying your titles. Π 1.(40628-7) @ $22.50
Π 2.(59328-1) @ $39.95 G 3. (82115-2) @ $250.00 Name Title Firm (College) Address City State -ZipPlease add state and local taxes where applicable. Prices subject to change without notice. A4736WI CIRCLE 256 ON READER SERVICE CARD
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no longer need to have every tubing connector available.
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1. TECHNIQUES AND APPLICATIONS OF PLASMA CHEMISTRY Edited by John R. Hollahan, Tegal Corporation and Alexis T. Bell, University of California, Berkeley Analysts . . . Technicians . . . Scientists and Engineers . . . learn how to apply the most successful applications of plasma chemistry to your work in organic chemistry, polymer, chemistry, biology, electronics and materials science. 1974 (Sept.) 416 pages $22.50 2. DETERMINATION OF GASEOUS ELEMENTS IN METALS Edited by Laben M. Melnick, United States Steel Corporation, Lynn L. Lewis, General Motors Corporation and Ben D. Holt, Argonne National Laboratory 21 experts give you a firm grasp of the under lying principles of the behavior of gases in metals, and show you how to choose the best method and instrumentation to determine gases in all common and many uncommon metals. 1974 720 pages $39.95
High Performance LIQUID CHROMATOGRAPHY PRODUCTS
The new
unique Unimetrics Omnifit Universal Connector allows you to connect tubing of glass, metal or plastic in any combin ation of these materials in sizes from 3mm to 11 mm O.D. The connect ors are chemically inert, autoclavable, and leak-
Pocket Microscope The McArthur microscope features 5 X 3 X 1-in. dimensions and precision compound optics, providing overall magnifications of 80 X, 200 X, and using a special eyepiece, 400X. A bat tery-powered light source is standard. Three versions are available, including the polarizing model and triple-objec tive model. The standard unit is priced at $84.50. Imanex International 402
tight to 600 psi. VALVES
PTFE Teflon with
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three-way, and seven-way valves. Chem ically inert, no dead space, autoclavable, each channel has variable diameter fit tings to connect tubing up to 3.95mm O.D., and pressure rated at 250 psi. Many combinations of switching possible to run numerous identical columns.
Portable Calibration System Model 320 calibration system can be operated on internal rechargeable nickel-cadmium batteries, a 12-V au tomotive system, or 110-V ac. De signed for the exclusive use of perme ation tubes, the unit's factory-set tem perature is 35° C, and the permeation tube can be maintained within 0.1°C of the set point with a meter readout for temperature verification. An inter nal pumping system produces a resettable, continuously variable dilution flow with a range of 300-1500 ml/min. Analytical Instrument Development, Inc. 420
C O L U M N S Flanges of PTFE Teflon. High Sensitivity with cross section of 0.33 cm . Seven lengths from 10mm to 1500mm. Jackets for temperature con-
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Vinyl Chloride Detection A new system for the detection of vinyl chloride features a flasher as sembly with electrical heater to pro vide energy to flash the collected sam ple from absorption tube to gas chromatograph. Vinyl chloride can be monitored in concentrations as low as 50 ppb, well below OSHA's proposed detection standard. Bendix Corp. 422
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CIRCLE 236 ON READER SERVICE CARD 1074 A • ANALYTICAL CHEMISTRY, VOL. 46, NO. 12, OCTOBER 1974
