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Detectors VPC · Hot Wire • Thermistor
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Γ/C Cells—On Stream
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Temperature Regulated Cells • HotWire —to 400° C • Thermistor—to 100° C
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NEW LITERATURE
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NEW SERVICE BULLETIN
BETTER PRODUCT
NEW PRODUCT
Serves the World!
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Pairs Hot Wire Filaments (in stock)
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SAS GRAND-MASTER—Portable T/C Analyzer • Amplified output for readout by RUSTRAK or ESTERLINE ANGUS recorders
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Semiconductor Special Power Supply for T/C Cells and VPC Detection • Microdial zero control • Low noise for 0-1 mv recorder readout
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See Gow-Mac new and better products at Booth No. 778 I.S.A. Expo sition or write for illustrated bulletins. Address inquiries to Dept. AC.
GOW-MAC INSTRUMENT COMPANY 1 0 0 KINGS ROAD, M A D I S O N , NEW JERSEY, U . S . A. - T e l . FRontier 7 - 3 4 5 0 Circle Να. 128 on Readers' Service Card
AUTHORITATIVE Near Infrared Spectra for your Beckman DK Published By Anderson Physical Laboratory • • • • • •
Range 0.7 to 3.2 microns Highest purity materials High resolution; excellent legibility Recorded on a Beckman DK-2 Quality reviewed by a panel of expert spectroscopists Indexed twice yearly
Exploitation of the fertile near infrared region, made accessible by the Beckman DK Spectrophotometers, must be based upon reliable reference data. The Anderson near infrared spectra, recorded under carefully controlled conditions on a DK-2 spec trophotometer and reviewed before publication by a panel of expert spectroscopists, provide a wealth of data which serve both as standards for comparison with unknowns and as raw material for the compilation of rules for the determination of structure. Over 800 spectra of diverse organic compounds have been recorded and additional curves are appearing at the rate of 100 per month. Write us for descriptive literature and sample curves.
NEW BOOKS
NEW BOOKS Fine Particle Measurement. Clyde Orr, Jr., and J. M. Dallavalle. xiv + 353 pages. The Macmillan Co., 60 Fifth Ave., New York 11, Ν. Υ. 1959. S10.50. This is the first single volume to present a detailed discussion of impor tant techniques used currently for measurement of size, surface, and pore volume. It treats both theory and ap plication of the measurements which are of vast importance since finely di vided material has so many uses in industries such as glass, rubber, ce ramics, and petroleum, and is also im portant to meteorologists and soil sci entists. It consists of ten chapters, besides appendix and bibliography. Their sub jects are significance of measurements; particle size determinations by mi croscopy, sedimentation, inertial tech niques, radiation, and transmission; surface area from permeametry; meas urement of surface area by gas adsorp tion; measurement of surface area by liquid-phase sorption and other meth ods, and pore size and distribution. "Universal" Air Pollutant Analyzer.
D. F. Adams, H. J. Dana, and R. K. Koppe. 37 pages. Community Air Pollution Program, 4767 Columbia Parkway, Cincinnati 26, Ohio. 1957. No cost. This paper bound publication de scribes two atmospheric pollutant an alyzers for producing dosimeter or continuously integrated records. These were assembled within a single metal enclosure and tested near Mead, Wash ington, and Waneta, British Columbia, and found to be satisfactory, one for sulfur dioxide using Starch-Iodine Blue indicator, and the other for hydrogen fluoride using Zirconium-Eriochrome Cyanine R as reagent. The report brings out the fact that no single in strument is appropriate for all pollut ants and that for each one a special instrument is probably required. There are eight chapters and a listing of lit erature cited. There are chapters for description of apparatus, sample chang ing sequence, reagents, performance, and achievements. Absorption Spectrophotometry.
CHICAGO
APPARATUS
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I71S Norlk faMwd « m m · OIIUCO 12, HUNOIS · WASMKTON OlfKI · 1*15 (yt Slrait, N.W. · Wnriihgn. 6, D.C CHICAQO A P P A R A T U S C O M P A N Y { M I S S O U R I } > 1*27 M M ft. · («MAS Off i , MCSOIKJ
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Circle No. 38 on Readers' Service Card ANALYTICAL CHEMISTRY
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F. Lothian. 2nd ed. viii + 246 pages. The Macmillan Co., 60 Fifth Ave., New York 11, Ν. Υ. 1958. $10.75.
