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the 15th supplement and have experi­enced difficulties in its use, ASTM is ready to remedy the situation. Please communicate directly with Albert L. Batik, Deputy Managing Director, Standards for Materials, Products, Systems & Services, ASTM, 1916 Race St., Philadelphia, Pa. 19103 (215-299-5400).

Hamamatsu Systems, Inc. (formerly RKB, Inc.), is a newly acquired sub­sidiary of the Hamamatsu Corp., headquartered in Middlesex, N.J. The company hopes to combine RKB's mi­croprocessor technology and Hamam-atsu's video system experience and vidicon manufacturing capability to speed the production of precise video instruments for inspection, research and quality control. Hamamatsu Sys­tems, Inc., will continue in the RKB location a t 5 Alfred Circle, Bedford, Mass.

Gelman Instrument Co. (600 South Wagner Rd., P.O. Box 1448, Ann Arbor, Mich.) has announced the for­mation of a new air analysis division.

Products manufactured and distribut­ed by the new division include: Gel-man's line of glass fiber and mem­brane filters, specifically designed for air sampling analyses; an extensive se­lection of open and closed filter hold­ers for atmospheric and in-line appli­cations; and a new line of field moni­tors suited for personal and open sam­pling, or at tached to a cyclone sam­pling apparatus. In addition, Gelman will distribute a particle analyzer which is designed to count particles in the size range of 0.5-400 μιη.

The International Conference on Modern Trends in Activation Anal­ysis has been held in Texas (1961 and 1965), Washington (1968), Paris (1972), and Munich (1976). The 1980 meeting will deal with original recent work on techniques and applications of activation analysis in many areas of science, technology, and medicine. A commercial exhibition will also be held concurrently with the conference. The choice of a site for the conference will be made early in 1978. Organiza­

tions and individuals wishing to be in­cluded in the consultations leading to the selection of a site are invited to write to: J. M. A. Lenihan, Depart­ment of Clinical Physics and Bio-En­gineering, 11 West Graham St., Glas­gow, G4 9LF, Scotland.

Robert S. First, Inc., has just com­pleted "A Comprehensive Directory of Independent Non-Hospital Clin­ical Laboratories in the United States". Information provided in the directory includes: name, address, and telephone number of laboratory; name of laboratory director; ownership of laboratory; classification as indepen­dent, chain, group practice, etc.; num­ber of employees; number of tests run annually; and types of tests done, such as clinical chemistry, RIA, hematolo­gy, microbiology, etc. The directory can be purchased from Robert S. First, Inc., 405 Lexington Ave., New York, N.Y. 10017 (212-490-3880) at $2 000 for the directory of the 500 largest laboratories, or $600 for the directory of the 100 largest laborato­ries.

SEPTUM SWINGER the perfect solution to G.C. septum pollution

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CHEMICALS FROM THE ATMOSPHERE

b y C h a r l e s H . S i m p s o n A n a b s o r b i n g v o l u m e t h a t t e l l s h o w t h e u s e o f a t m o s p h e r i c g a s e s e m e r g e d i n t o a g i a n t i n d u s t r y . The a u t h o r d e f t l y p i e c e s t o g e t h e r t h e e x c i t i n g c h a i n o f e v e n t s . H i s t o r y c o m e s a l i v e — a i r a n d t h e a n c i e n t s . . . t h e o x y a c e t y l e n e f l a m e . . . ex ­

p e r i m e n t s in l i q u i f i c a t i o n . . . r e f r i g ­e r a t i n g m a c h i n e s a n d l i q u i d air . . . m o d e r n a i r s e p a r a t i o n p l a n t s . . . c r y o g e n i c f l u i d s . . . a n d o t h e r s . Chemis t ry in Act ion Ser ies 181 pages 1973 Paperback $3.75

Postpa id in U.S. and Canada, plus 25 cents e lsewhere.

Spec ia l Issues Sa les A m e r i c a n C h e m i c a l S o c i e t y 11 5 5 S i x t e e n t h St . , N .W. W a s h i n g t o n , D.C. 2 0 0 3 6

CIRCLE 173 ON READER SERVICE CARD 510 A • ANALYTICAL CHEMISTRY, VOL. 49, NO. 6, MAY 1977

ΡIERCE

ELIMINATE: Septum bleed, leakage and conditioning in your gas chromatograph! NOW: Change septa anyt ime w i thou t con­d i t ion ing , system restabil ization or pneumatic upset! HOW? With the new Septum Swinger — Makes use of the septum only during injection and then replaces it with smooth metal! Screws onto any injector with 7/16" -20 Ν F threads (same as 1/4" Swage-lok®nut) .

PIERCE

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