ALPHABETICAL LIST OF ADVERTISERS
MEASURE ΔρΗ TO 0.0005 UNITS
ι Ctmtimied from page 126 A)
with Cary Model 31 Vibrating Reed Electrometer
Waring Products Corp 25 A tien ay- -Graceman Advertising, Inc. The Welch Scientific Company 110 A g c η c y — A r m s t r ο η g A d ν e rtisinji Agency, Inc. The Welch Scientific Company 77 Agency—H. A. Hooker Advertising Agency, inc. Wild-Heerbrugg Instruments, Inc 68 Agency--Duncan-Brooks, Inc. Wilkens-Anderson Co 85 Agency—Manriabach &: Simms, Inc. Wilkens Instrument & Research, Inc.. . 37 Agency—Boh Barriskill Advertising Carl Zeiss. Inc Agrncy-G. M. Basford Co.
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Laboratories Supply Center 124:125 Bio-Rad Laboratories Burdick & Jackson Laboratories Clark Microanalytical Laboratories Dimco-Gray Co. Eastern (chemical Corp. George W. Gates Co. Wm. T- Hacker Co. [arn-li-Ash Co. Laboratory Equipment Corp. LaMotte Chemical Products Co. National Spectrographs Laboratories, Τικ. Oxford Laboratories, Inc. Petroleum Analytical Research Ultra-Yiolet Products, Inc. West Coast Analytical Laboratories, Inc. Wis· onsin Alunmi Research Foundation
RK1MIOLO PUBLISHING CORPORATION Adi· rtising Management for the American CItemical Society Publications Merald Luc. Advertising Sales Manager American Chemical Society Publications -Kit) Park Ave, New York 22, Ν. Υ. Cable Address: REINPUB NYK
ADVERTISING SALES REPRESENTATIVES I'homits Λ\ J Kocnvcr, Advertising Sales Manager New York 22 . . . Sam W. Percy, J. Barrv Stanford. Clay S. Holden, Keinhold Publishing Corp.. 430 Park Ave., MUrrav Hill S-8600 Chicago 2 . . . Eugene P. Eldridge, Reinhold Publishing Corp., I l l W. Washing ton St., RAndolph 6-8497 CIe\ eland 14 . . . Rodney D. Long ( Cleve land Manager, Reinhoïd Publishing Corp.), East-Ohio Bldg., 1717 East 9th St., PRospeet 1-4011 San Francisco 5 . . · Morton McDonald, McDonald-Thompson, Inc., 625 Market St., EXbrook 7-5377 Los Angeles 5 . . . Ε. Ί . Thompson, George E. Halleman. Jr., McDonald-Thompson, Inc.. 3727 W. 6th St., DTJnkirk 7-5391 Seattle 4 . . . T. H. Abney, McDonaldThompson, Inc., 1008 Western Ave., MAin 3-3766 Portland 1 . . Francis M. Eaton, McDonaldThompson. Inc., 2035 S. W. 58th Avenue, CApital 2-5146 Denver 3 . . . Robert H. Heidersbach, Mc Donald-Thompson, Inc., 840 Lincoln St.. 825-3325 Houston 6 . . . Frank N. Vickrey, McDonaldThompson, Inc., 3217 Montrose Blvd.. JAckson 9-6711 Dallas 19 . . . C. Parker Harris, McDonaldThompson, Inc., 2727 Oak Lawn Ave., LAkeside 1-1266 Great Britain and Western Europe . . . Brayton Nichols, The American Magazine Group, 7 Blenheim Street. London W. 1, England Circle No. 15 on Readers' Service Card
New data sheet on pH measurements plus details on Cary Model 37 are available by writing for Data File A233-72.
Sensitivity to 0.0002 pH units and exception ally high input resistance make the Cary Model 31 the ideal voltmeter for measuring glass electrode potentials. It draws less than 10~16 amperes, even with input EMFs up to one volt— especially important with easily polarized high resist ance electrodes. Drift is only 0.002 pH units per day, as suming constant temperature. Other uses for the Model 31 include radioactivity measurements (detects C14 activity to 5x10 - 1 5 curies per mg BaC0 3 ) and mass spectrometry (dects ion currents small as 10~17 amperes). APPLIED PHYSICS CORPORATION 2*724 SOUTH PECK ROAD · MONROVIA, CALIFORNIA
INSTRUMENTS Raman/UV//R
Recording Spectrophotometers · Vibrating Reed Electrometers
