N e w Becker 4 0 7 Series Gas C h r o m a t o g r a p h s
Unique research instruments priced f r o m only $2,175.00 • True Computer-Compatibility —A separate output direct from the chromatograph provides a full-range signal for integration. • Built-in Flow Controls —An exclusive, pressure-regulating flow controller is part of the instrument, not an option. Provides accuracy better than 0 . 1 % . • Research-Quality Oven —A full size (7% χ 7% x 8 % " ) oven with a temperature range of 30 to 400°C and stability within 0.1 °C. • Wide-Range Electrometer —Low system noise, linear dynamic range of more than 200,000, and a time constant of 50 milliseconds produce clean signals which allow full use of electronic integrators and computers. The low cost of Series 407 Chromatographs was achieved by limiting their ver satility, not by compromising quality. That makes them an ideal purchase for the research lab with an urgent need to add capacity, but a limited budget. 407 Series instruments can be used to implement techniques developed on more sophisticated chromatographs, without loss of data comparability. Clip and mail the coupon for 16-page Catalog 1124 Β
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Special Issue Offer The July-August 1969 issue of CHEMISTRY, devoted to scientific meth ods of crime investiga tion, is available at $1.00 for the first copy and 50 cents for each additional copy. Feature articles include "Di mensions of Crime Today", "Ori gin of Modern Criminology", "Scientific Methods of Crime In vestigation", and "Chromosomes and Crime". Also included: the story of how the lie detector was developed; how cause of an air plane crash was deduced from a single seat cushion; and a com prehensive reading list on crime and scientific methods used in crime investigation. Some readers' comments : comprehensive; fun-reading; a fascinating issue; a work of art in make-up and content. Send your order to : Reprint Department American Chemical Society 1155 16th St. N.W. Washington, D.C. 20036
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Circle No. 154 on Readers' Service Card 152 A
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ANALYTICAL CHEMISTRY, VOL. 43, NO. 2, FEBRUARY 1971
