EDITORS' COLUMN
trie current, shock, and vibration, and are especially sensitive to tem perature. Tipping of a cell by more than 45° or inadvertent contact of the terminals of the cells with each other would cause permanent dam age. For the trip, the cells were housed in a special box designed to minimize temperature change, shock, and vibration, and the in terior of the box was darkened. The cells were then transported under police escort to their final destination. New Russian Journals Translated
The Faraday Press, Inc. of New York is now publishing for the first time the complete cover-to-cover translations of 29 key Soviet jour nals. A large number of specialized journals were launched in the USSR last year as a result of a major re organization of the scientific pub lishing industry. Titles of special interest to chemists are as follows: Theoretical and Experimental Chemistry; Chemistry of Hetero cyclic Compounds, Chemistry of Natural Compounds; Applied Bio chemistry and Microbiology ; Men deleev Chemistry Journal; Soviet Progress in Chemistry; Journal of Applied Spectroscopy ; Soviet Fluid Mechanics; Applied Solar Energy ; Polymer Mechanics; Mos cow University Chemistry Bulletin; Combustion, Explosion, and Shock Waves; Journal of Engineering Physics; and Soviet Genetics (all titles translated). There is a period of several months between receipt of the original Russian journal and publi cation of the translation. Annual subscriptions are as low as $90 and as high as $160 for one of the trans lated journals, with an additional $5 for subscriptions sent outside the U. S. and Canada. Free author and title indexes are supplied with the last issue of each volume that is subscribed to. A catalog that describes each of the journals more fully is available from the publisher, 84. Fifth Ave nue, New York, Ν. Υ. 10011.
YOU'LL WANT TO KNOW MORE ABOUT
metal membrane filters.. So we offer a bulletin that explains all about these pure silver membranes of extremely uniform porosity. This bulletin de scribes the Flotronics Metal Membrane's corrosion resistant and bacteriostatic characteristics, how it will filter out all particles above 5 microns in size, and how the finest of six porosity grades filters out everything bigger than .2 micron. You'll learn why metal membrane filters are preferred for micro-filtrations and for general laboratory and production filtrations of pharmaceuticals, biologicals, fine chemicals and beverages. And you'll read about the membrane's positive surface retention, how it does not adsorb filtrates to any mea surable degree, and how it can be cleaned for repeated usage. An important footnote: Flotronics Metal Membrane Filters cost no more than less advantageous filtering media. For ALL the facts on Flotronics Metal Membrane Filters, send for your free copy of Bulletin MMF-1.
SELAS Flotronics
A Division of Se/as Corporation of America Box 300, Spring House, Pa. 19477 Telephone: (215) 646-5950 Circle No. 145 on Readers' Service Card
FOR THE BEST IN TEMPERATURE CONTROL— THE TEMPUNIT Range: ambient to 95°C • Precision ± 0.02°C Pump capacity 80 gals/hr. • Heater 500w or lOOOw Fits any bath • Price $170.00 The TEMPUNIT is a combination of heater, thermostat, stirrer and centrifugal pump for main taining constant t e m p e r a t u r e in a liquid bath and for circulating the liquid through e x t e r n a l npparatus. I his instrument is being used all over the w o r l d and is w i d e l y r e g a r d e d as the finest o f its kind available today. A p a r t from the Tempunit, TECHNE has a w i d e r a n g e of thermostatic w a t e r baths designed t o meet all your l a b o r a t o r y needs. TECHNE are also manufacturers of the unique fluidized baths which p r o v i d e a constant t e m p e r a t u r e liquid bath up to as high as 6 0 0 ° C (111 2°F). Each of TECHNE's instruments is exceptionally novel and technologically interesling, based on our o w n k n o w l e d g e and research. W r i t e to us for particulars.
T E C H N E
Techne (Princeton) Limited 661 B r u n s w i c k Pike P r i n c e t o n , N e w Jersey 08540 Area C o d e : S09-452-9Z75
Circle No. 79 on Readers' Service Card VOL. 38, NO. 8, JULY I 9 6 0
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