NEWS
C H O P P E R S T A B I L I Z E D D-C
AMPLIFIER
Clinical Chemists to Meet The American Association of Clinical Chemists will meet at Indianapolis, Ind., December 26 to 31 during the meeting of the American Association for the Advancement of Science. October 15 is the deadline for ab stracts. The abstracts should be sent double spaced, in triplicate, to Albert E. Sobel, Jewish Hospital of Brooklyn, Brooklyn 38, Ν. Υ.
for use with galvanometer-type recording instruments such as Esterline-Angus, etc. • Ι Ο mv. input across V2 megohm produces 1 ma. in - I 5 0 0 ohm load • Less than 1 % zero drift • Linearity 1 % • Accuracy 2 % • Freq. resp. 0 - 2 cps. • Power 15 watts, 115 ν 6 0 cps.
Podbielniak Institute Offers Short Courses
• 5'/ 2 x 5>/2 x 8 i n c h e s
$120.00 Inquire about Model WI-IO
Industrial Instruments Division · Mandrel Industries, I n c . 5 1 3 4 Glenmont Drive · Houston, T e x a s W r i t e : P. O . B o x 1 3 2 4 3 , Z o n e 1 9
For further information, circle number 46 A-1 on Readers' Service Card, page 99 A
SS-1 & SS-1A SUPERSPEED ANGLE CENTRIFUGE NOvv—Sealed
Analytical Division Program Changes
Rotor with Superspeeds
up to 16,000 rpm—32,700 x G—400 ml Have you asked us about ourNEWServall "SzentGyorgyi—Blum" Con tinuous Flow Centri fuge? SS-1 and SS-1A may be adapted.
"The workhorse of the modern research laboratory" Only SBBVALL offers you speeds and capacity in these ranges, together with a rotor and cover that give an airtight seal against escape of rotor contents—• maximum safety for personnel when infectious or otherwise hazardous ma terials are being centrifuged. Eight rotor compartments accommodate 60 ml tubes, or adapters for wide range of smaller tubes. SEBVALL-BLUM designed Self-Centering Direct Drive Assembly ensures smooth, trouble-free operation. Variable transformer for remote control. New literature available : Write for Bulletin AC-91S.
Ivan Sorvall, Inc. NORWALK
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DESIGNERS, MANUFACTURERS A N D DISTRIBUTORS OF " 3 E R V A I L " LABORATORY INSTRUMENTS
CONNECTICUT
Since 1943 the World's largest manufacturer
of Superspeed
Centrifuges.
For further information, circle number 46 A-2 on Readers' Service Card, page 99 A 46 A
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ANALYTICAL CHEMISTRY
Classes on vapor phase chromato graphic techniques, and low and high temperature distillation will be given in four two-week courses during 1957-58 by Podbielniak Institute. The intensive training periods are to cover theory and practical application, and will be presented by a regular teaching staff plus guest lecturers. En rôlées may combine a single week of chromatography with one of distillation, or may take a two-week course exclusively in vapor phase chromatography. The school brochure, course outlines, and application blanks are obtainable from Podbielniak Institute, 341 East Ohio St.. Chicago 11, 111.
Several changes have been made in the program of the Division of Analytical Chemistry at the ACS meeting to be held in New York, Sept. 8 to 13. These changes occurred after the program was printed in the August issue (page 25 A). The changes are as follows: A. C. Nawakowski will present a paper "Quantitative Analysis of Tri(nonylated phenyl) Phosphite (Polygard) in Synthetic Rubber. This will be the last paper on the general session, Monday, Sept. 9. Papers by Eliot Butler, Dennis Peters, and Ε. Η. Swift, scheduled for the general session on Tuesday after noon and that of A. M. Feibush, Keith Rowley, and Louis Gordon, scheduled for the general session on Wednesday morning will be switched. Harry Baum will preside at the gen eral session on Tuesday afternoon instead of Ε. Η. Swift. The complete program of the ACS meeting appears in the Aug. 5 issue of Chemical and Engineering News.
