MANUFACTURERS' LITERATURE Air, 44-p catalog lists instruments and apparatus for air sampling, monitoring, and analysis. Curtin Scientific Co. 713-923-1661 460 Optical-multichannel analyzer, Model 1205, 4 p, describes instrument which features simultaneous integration of dispersed spectrum into each of 500 channels. SSR Instruments. 213-451-8701 461 Laboratory catalog, 1972, 4 sections: appearance measurements, 26 p ; physical testing, 68 p ; rheology, 18 p ; and lab apparatus, 28 p. Gardner Laboratory Inc. 301-656-3600 462
BUN, glucose analyzers, 8 p, includes information on salt instruments which use enzyme rate-sensing techniques. Beckman Instruments, Inc. 714-8714848 470 Stopped-flow fluorescence and light scattering, Bulletin 63, 4 p, describes instruments and accessories for measuring over a time span of 5 msec to 50 sec. Durrum Instrument Corp. 415321-6302 471 Reagents, 6 p, 1972 catalog lists and prices ultrapure organic reagents, single crystals, high-purity liquid crystals, and nematic liquid-crystal formulations designed for dynamic scattering applications. Princeton Organics. 609-9216678 472 Infrared cells, 9 data sheets illustrate and describe macro, micro, and ultramicro ir cells for liquids, mulls, and gases. Barnes Engineering Co. 203348-5681 473
PREPTLC ΙΝΑ "DRYCOLUMN"?
Electromechanical instruments, 120-p catalog gives specifications of thousands of terminated inventory electronic and mechanical instruments including transducers, gyros, recorders, amplifiers, etc. Datacraft, Inc. 213-323-9120 464
Hollow cathode lamps, 6 p, includes data on 68 single-element and most multielement lamps for use with atomic absorption spectrophotometers. OCLI. 203-853-2224 474
Transfer analytical TLC separations DIRECTLY to a prep arative scale using open "DRY" columns packed with Woelm Alumina or Silica Gel.
Instrument rental, 108 p, specifications on rental instruments including transducers, oscillographs, digital systems, computers, etc. Datacraft, Inc. 213321-2320 465
Short courses and workshops, 3 brochures describe programs in analytical chemistry, chemical and process engineering, and general short courses and workshops. Center for Professional Advancement, 29 Division St., P.O. Box 997, Somerville, NJ 08876 475
Chemicals, 1972 catalog lists organometallics, polymer standards, liquid crystals. Pressure Chemical Co. 412682-5882 463
Metals foils, ultra-thin, 71-72 catalog, 54 ]), with price conversion tables; 1000 foil items (0.00002-0.006 in.). Goodfellow Metals, Ltd., Tîuxley Towers, Claygate-Eshcr, Surrey, England Spectrophotometer accessories, 20-p, all accessories for the 124 Series of double-beam scanning spectrophotometers including automatic recording and printing. Coleman Instruments. 312-345-7500 466 Argon-plasma excitation source, 4 p,
describes advantages of SpectraJet single pushbutton-operated source for speetrochemical analysis, runs at 10,000°K. Spectrometries, Inc. 617-2720540 467 Data handbook, ISCOTABLES, includes density gradient sedimentation coefficients, ultraviolet extinction coefficients of many viruses, spectra intensity and distribution of various light sources, etc. Instrumentation Specialties Co. 402-434-0231 468 Detector replacement, wall chart lists major GC makers, their instrument models, and proper Gow-Mac replacement element for the thermal-conductivity gas chromatographs. Gow-Mac Instrument Co. 201-377-3450 469
Dry-column chroma tography is: FAST SIMPLE CONVENIENT REPRODUCIBLE
Quartz spectrophotometer cells, 8 p,
lists 333 different rectangular, cylindrical, micro, and flow through cells. Markson Science Supply. 714-755-6500 476 Micro syringes and accessories, 16-p catalog includes size and cost information, specifications including micropipeter, septums, needles, etc. Unimetrics Corp. 714-879-3777 477 Gas analyzer, 16 ρ describe digitized quadrupole mass analyzer Model 100C; computer compatible; performance characteristics and applications. TJTI. 408-738-3301 478
ECONOMICAL
For complete infor mation on the "drycolumn" technique, send for TR 71-905, an illustrated 10-page brochure which dis cusses solvent system requirements, types of adsorbents used, preparation of col umns, column load ing, developing, and the relationship be tween column size and expected yield.
Laser spectroscopy, 5 ρ introduce laser spectroscopy detector system (LSDS), modular instrument for measuring pulse intensities in optical spectroscopy. Molectron Corp. 408-738-2661 479 Chemicals, 1972 catalog lists some 2500 chemicals for researchers including ultra-pure chemicals and metals, AIÎ reagents, and lab accessories. Apache Chemicals. Inc. 815-877-7858 480
WATERS ASSOCIATES INC. 61 Fountain Street Framingham, Massachusetts 01701 THE LIQUID CHROMATOGRAPHY PEOPLE CIRCLE 2 1 1 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 44, NO. 6, MAY 1972
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