2 FREE References:
Briefs
the Heath/Schlumberger Spectroscopy Catalog...and Specttoph
Estimation of the Chemical Shifts of Aromatic Protons Using Additive Increments Jane Beeby and Sever Sternhell, Department of Organic Chemistry, University of Sydney, Sydney, Australia, and T. HoffmannOstenhof, Erno Pretsch, and Wilhelm Simon, Laboratorium fur Organische Chemie, Eidgenôssische Technische Hochschule, Zurich, Schweiz Anal. Chem., 45, 1571 (1973) Efficient V a c u u m Fractional-Sublimation Apparatus Keith Gosling and Richard E. Bowen, Department of Chemistry, West Virginia University, Morgantown, W. Va. 26506 Anal. Chem., 45, 1574(1973) Simple, Efficient Micro Mixing Device Robert E. Gugger and Samuel M. Mozersky, Eastern Regional Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Philadelphia, Pa. 19118 Anal. Chem., 45, 1575(1973) Continuous Flow Krypton Adsorption for Low Surface A r e a M e a s u r e m e n t s Seymour Lowell, C. W. Post College, Long Island University, Greenvale, N.Y. 11548 Anal. Chem., 45, 1576(1973) Charts for S a m p l e Amounts Corresponding to a SelfShielding Factor of 0.9 in Thermal Neutron Activation Analysis Minoru Okada, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan Anal. Chem., 45, 1578 (1973) Instrument for Time-Resolved Phosphorimetry Using an Electronically Gated Photomultiplier T. D. S. Hamilton, Atomic and Molecular Physics Group, Department of Physics, The University, Manchester, M13 9PL, U.K., and K. Razi Naqvi, Department of Chemistry, The University, Sheffield, S3 7HF, U.K. Anal. Chem., 45, 1581 (1973) Solid Injection System for Gas Chromatography E. C. Pease, Gulf Oil Canada Limited, Research and Development Anal. Chem., 45, 1584 (1973) Centre, Sheridan Park, Ontario
the
Heath/Schiumberger Electronic Instrumentation catalog
Sophisticated, research-grade equipment for laboratory, R&D, design work and education... all at budget-stretching prices. These two free catalogs can provide you with one-stop shopping for virtually all of your instrumentation needs. Typical of the high performance, low cost equipment you'll find is the EU-721 Ratio-Recording Spectrophotometer that uses the unique alternating cell principle, complete with multi-speed recorder.. .just $4995*. A 600 MHz frequency counter with 10 mV input sensitivity and complete programmability for only $795*...and hundreds more. To get your two FREE catalogs now, visit your local Heathkit Electronic Center or use the coupon below. Heath/Schlumberger Scientific Instruments Dept. 581-016 Benton Harbor, Michigan 49022 • Please send new Spectroscopy catalog. • Please send '73 Electronic Instrumentation catalog. Title Company/lnstitution_ Address City_
-ZipPrices & specifications subject to change without notice. •Mail order prices; F.O.B. factory. EK-358R CIRCLE 9 9 O N READER SERVICE CARD
ANALYTICAL
CHEMISTRY,
VOL.
45,
NO.
8, J U L Y
1973
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701
A
