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EPR Cavities ®
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TUN1WG SCREW
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COUPLING SECTION
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SPECIFICATIONS: Frequency 9.5 GHz (x Band) Q 7000 min, 10,000 Typical Mode TE 102 Sample Tube 11mm Diameter max. Required Gap 1.4" Modulation Internal Coils
OPTICALTKANSMISSION PATH
These p r e c i s i o n cavities o f f e r h i g h Q , small r e c t a n g u l a r size, a n d a m a z i n g versatility. Modular construction means y o u can m o d i f y t h e basic cav i t y i n y o u r lab f o r d u a l s a m p l e oper ation and a variety o f sample irradi ation configurations (including in c o r p o r a t i o n o f an o p t i c a l trans m i s s i o n p a t h ) . Send P.O., s a t i s f a c t i o n guaranteed o r return f o r f u l l credit.
O . S. W A L K E R C O . ,
OPTIONAL SiC0rK> CAVITY
MODELS & PRICES SC-14-X (Β, Α , Ο $1485 SC-14-UVX (B, A , D) . . . . $1585 SC-14-UVSX (B, A , E, F) . . . $1595 SC-14-UVTX (G, A , E, F) . . . $1595 For dual cavity, specify SC-14D-(Suffix), Add $800 (includes second cavity A and H)
INC. MSI DIVISION
R O C K D A L E S T R E E T , W O R C E S T E R , M A S S . 01BOS Circle No. 189 on Readers' Service Card
P H O N E : B17 B 5 3 - 3 2 3 2
R R B. Sensitivity for $1925 with P A R
Model 174 Polarographic Analyzer
June 2 9 to July 1 — 2 5 t h Anniversary Meeting of t h e Electron Microscopy and Analysis Group. Cambridge, England. Contact: Meetings Officer, The I n s t i t u t e of Physics a n d T h e Physical Society, 4 7 Belgrave S q . , London, S W 1 , England. 01-2356111. Page 6 0 A, Mar. June 3 0 to July 2 — 1 6 t h Symposium and Exhibition, American Scientific Glassblowers Society. Pfister H o t e l , M i l w a u k e e , W i s . Contact: George A. Sites, ASGS, 3 0 9 Georgetown Ave., W i l m i n g t o n , Del. 1 9 8 0 9 July 1 2 to 14—International Confer ence on Calorimetry and Thermody namics. University of Maine, O r o n o , Me. Sponsor: IUPAC a n d C a l o r i m etry Conf., University of Maine. Con tact: G. C. Sinke 1 7 0 7 Bldg., Dow C h e m i c a l Co., M i d l a n d , M i c h . 4 8 6 4 0 July 1 2 to 1 6 — T h i r d Conference of the Society for Analytical Chemistry. D u r h a m , England. Contact: M r . F. C. S h e n t o n , C o u n t y A n a l y s t ' s Dept., C o u n t y Hall, D u r h a m , England July 1 9 to 23—Conference on Comput ers in Chemical Education and Re search. N o r t h e r n Illinois University, DeKalb, III. Contact: F. M . Miller, Dept. of C h e m i s t r y , N o r t h e r n Illinois University, DeKalb, III. 6 0 1 1 5 July 2 5 to 3 0 — X X I I I r d International Congress of Pure and Applied Chem istry. B o s t o n , Mass. Contact: Sec retariat, XXIIIrd IUPAC, c / o A m e r i c a n C h e m i c a l Society, 1 1 5 5 1 6 t h St., N. W., W a s h i n g t o n , D. C. 2 0 0 3 6 . 202-737-3337 July 2 6 to 3 0 — 3 0 t h ISA Research Con ference on Instrumentation Science. H o b a r t & W m . S m i t h College, Geneva, N. Y. Contact: S. Lees, Forsyth Dental Center, 1 4 0 Fen Way, B o s t o n , Mass. 0 2 1 1 5 July 2 8 to 3 0 — S i x t h National Confer ence on Electron Probe Analysis. H i l t o n H o t e l , P i t t s b u r g h , Pa. Spon sor: Electron Probe Analysis Society of A m e r i c a . Contact: Lawrence F. Vassamillet, Mellon I n s t i t u t e , 4 4 0 0 Fifth A v e . , P i t t s b u r g h , Pa. 1 5 2 1 3 . Page 8 7 A, Feb.
'«*£ ANALYZE • Organics • Pharmaceuticals • Pollutants • Metals
BY • • • •
Differential Pulse Pulse Tast DC Polarography
The PAR™ Model 174 Polarographic Analyzer complete with drop timer costs just $1925. Its part-per-billion sensitivity could heretofore only be found in units costing five times as much. The Model 174 brings all the analytical applications of ultra-sensitive polarographic techniques within the reach of any lab. For complete information, call or write Princeton Applied Research Corporation, Box 565, Princeton, New Jersey 08540; telephone (609) 452-2111. PRINCETON APPLIED RESEARCH CORPORATION Circle No. 158 on Readers' Service Card 72 A
Contact: A m e r i c a n Society f o r Test ing a n d M a t e r i a l s , 1 9 1 6 Race St., Philadelphia, Pa. 1 9 1 0 3 . 215-5694200
· ANALYTICAL CHEMISTRY, VOL. 43, NO. 4, APRIL 1971
Aug. 8 to 1 3 — A m e r i c a n Association of Clinical Chemists National Meeting. Plaza a n d O l y m p i c Hotels, Seattle, Wash. Contact: AACC, 1 1 5 5 1 6 t h St., N. W., W a s h i n g t o n , D. C. 2 0 0 3 6 Aug. 9 t o 1 0 — 1 3 t h Annual Rocky Mountain Spectroscopy Conference. Albany H o t e l , Denver, Colo. C o n t a c t : George M . Pachelo, Dow Chemical Co., Bldg. 5 5 9 , P. O. Box 8 8 8 , Golden, Colo. 8 0 4 0 1 Aug. 9 to 1 3 — G o r d o n Research Confer ence on Analytical Chemistry. New Hampton School, New H a m p t o n , N. H. Contact: Alexander M. Cruickshank, Pastore C h e m i c a l L a b . , University of Rhode Island, K i n g s t o n , R. I. 0 2 8 8 1 Aug. 1 1 to 1 3 — 2 0 t h Annual Denver Conference on Applications of X-Ray Analysis. Albany Hotel, Denver, Colo. Contact: C. O. R u u d , Dept. o f
