Manufacturers' Literature Catalogs pH Electrodes. Over 30 types of electrodes are described including combination electrodes, separate reference and measuring electrodes, metallic electrodes, ion electrodes, and temperature electrodes. 7 pp. Pope Scientific Inc. 453 Needle Valves. Describes the complete line of needle valves for use in instrument air lines, panel boards, sampling systems, corrosives, metering service, pilot plants, and research laboratories. 24 pp. Hoke Inc. 454 Spectrophotometer Cells. Features standard cells as well as anaerobic, micro, water-jacketed, and self-masking cells. Most cells available in optical glass, UV quartz, IR quartz, ES quartz, or Quarasil. 16 pp. Precision Cells Inc. 455 Laboratory Supplies. Contains information on the complete line of products available for the laboratory. 196 pp. Lab-Line Instruments, Inc. 456
Laboratory Supplies. Features sterile sampling systems, centrifuges, glass stills, reference books, microscopes, and many more products for the laboratory. 40 pp. Ace Scientific Supply Co.
457 Chromatographic Accessories. Details the complete line of micro syringes, micropipetters, valves, fittings, Teflon tubing, pressure sample injectors, rotary valves, pneumatic actuators, miniature tubing fittings, plus other accessories. 40 pp. Unimetrics Corp. 458 Inorganic and Organic Laboratory Reagents. Price List 771C lists more than 3000 reagents including new "instrument-matched" solvents designed to excel at specific methods of instrumental analysis. 117 pp. J. T. Baker Chemical Co. 459
For more information on listed items, circle the appropriate numbers on one of our Readers' Service Cards
Microliter Syringes. Features full line of syringes including fixed needle, removable needle, guided plunger, gas-tight, and HPLC syringes plus repair kits and accessories. 15 pp. Scientific Glass Engineering, Inc. 460 Scientific Apparatus. Includes laboratory vibratory analytical mill, Micro-Mesh/ Micro-Sort sieves, new time-temperature controller, glass/Teflon homogenizers, gas leak detector, hand-held pyrometer, and information on sample concentration, tissue homogenization, and particle sizing. 32 pp. Tekmar Co.
461 Laboratory Products. Update features many items of general interest to the laboratory scientist, as well as items specifically related to the use and handling of compressed gases. 32 pp. Matheson Update 462 Laboratory Clamps. Describes the full line of laboratory clamps, lab frames, and lab frame components. 8 pp. GCA/ Precision Scientific Group 463
S.G.E.
gas chromatography
mass spectrometry
accessories
Capillary Columns and Support Cages
Molecular Jet Separator
Head Office Scientific Glass Engineering Pty. Ltd., 111 Arden Street North Melbourne, Australia 3051 Tel: 329 6633
Valves and Low Hold-Up Unions
Syringes
U.S. Office Scientific Glass Engineering, Inc. 2800 Longhorn Blvd., Suite 104 Austin, Texas 78759 Tel: 5 1 2 / 8 3 7 - 7 1 9 0
European Office Scientific Glass Engineering (U.K.) Ltd., 657 North Circular Road, London NW2 7AY, Great Britain Tel: 0 1 - 4 5 2 - 6 2 4 4
CIRCLE 190 O N READER SERVICE CARD
1244 A • ANALYTICAL CHEMISTRY, VOL. 49, NO. 14, DECEMBER 1977
Glass Lined Tubing and Graphite Ferrules
