Manufacturers' Literature
No sacrifice in response or efficiency. Choose a Sargent combination pH electrode by size alone.
Both of these Sargent combination pH electrodes cover the entire pH range from 0 to 14 pH. Both offer fast, linear responseeven in highly acid solutions. Response to alkali ions is insignificant below pH 12.5 (at higher pH, response is low and stable). Both electrodes achieve high efficiency, with a millivclt/pH response close to the Nernst coefficient. And you get this kind of performance over a range of 0 to 80°C. These electrodes also feature all-glass, shock-resistant construction. No rubber or plastic to contaminate samples. No pockets to trap solutions or hamper cleaning. Stainless-steel caps provide sure, strong clamping. What's the difference, then, between these two combination pH electrodes? Size alone. For samples as small as Vz ml or those in extremely confined volumes, choose the miniature electrode (priced at $42.00). Otherwise, your best choice is the standardsize ($40.00). Both come with connecting cable and plugs to fit all popular pH meters. Call your Sargent man or write to us for a closer look at these combination pH electrodes or for data on our complete line of glass and reference electrodes.
Laboratory Centrifuge. An 8-page bulletin, 1-69, gives details and illustrations of the general laboratory centrifuge. Ivan Sorvall, Inc., Norwalk, Conn. 06856 625 Auger Electron Spectrometer. A 12-page brochure describes the history and operation of Auger spectroscopy, applications, and details of the company's instrument. Varian, 611 Hansen Way, Palo Alto, Calif. 94303 626 Immunodiffusion and Immunoelectrophoresis Directory. The directory provides a simple summary of the characteristics and forms of the various instruments in the field, and serves as a guide in clinical analysis and immunological research. National Instrument Laboratories, Inc., 12300 Parklawn Dr., RockviUe, Md. 20852 627 Analytical Instrumentation. A compact 8-page catalog-type brochure, No. 0700-5, includes information on nondispersive infrared analyzers, process chromatographs, combustible gas alarms, thermal conductivity analyzer, oxygen analyzer, hydrogen flame hydrocarbon analyzer, and carbon monoxide alarm. Mine Safety Appliances Co, 201 N. Braddock Ave., Pittsburgh, Pa. 15208 628 Scanning Electron Microscope. "The Oak Leaf" from the U. S. Naval Ordance Laboratory at White Oak, Md., describes, in 3 pages, a scanning electron microscope installed at the lab. This instrument is said to be the only commercially produced scanning microscope with an ion-pumped vacuum system. K. Square Corp., Pennwood and Lamar, Pittsburgh, Pa. 15221 629 Colorimetry. A 3-page reprint, Optical Resource Letter on Colorimetry by Gunther Wyszecki, from J. Opt. Soc. Am., 59, 123 (1969) is obtainable by writing to the society and requesting Optical Resource Letter OC-1. Enclose a large stamped return addressed envelope. Optical Society of American, 2100 Pennsylvania Ave., N.W., Washington, D. C. 20037
SARGENT-WELCH Scientific instruments, apparatus, chemicals. Sargent-Welch Scientific Company 7300 N. Linder Ave.; Skokie, Illinois 60076 Chicago/Anaheim/Birmingham/Cincinnati Cleveland/Dallas/Denver/Detroit Springfield, N.J ./Toronto/Montreal/Vancouver
Circle No. 100 on Readers' Service Card 108 A
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ANALYTICAL CHEMISTRY
Radiometry. A 6-page reprint, Optical Resource Letter on Radiometry by F. E. Nicodemus, from J. Opt. Soc. Am., 59, 243 (1969) is obtainable by writing to the society and requesting Optical Resource Letter Or-2. Enclose a large stamped return addressed envelope. Optical Society of American, 2100 Pennsylvania Ave., N.W., Washington, D. C. 20037
