NEWS
B I D D L E *?*tà&uc*Pte*tt Tteovm A P I E Z O N O I L DISTILLATES for H I G H VACUUM W O R K These Apiezon products have t h e recognition of leading scientists who accord them t o p preference for high vacuum work. Because of t h e exceedingly low vapor pressure of all these oil distillates, a t usual room temperatures, t h e y a r e in great demand for all sorts of high vacuum work. Their vapor p r e s s u r e s a r e as low as I 10- 6 m m . H g , a n d e v e n J unmeasurable at room | temperature. As t h e exclusive distributor in t h e United States, we I offer immediate delivery I from stock on t h e complete | range of these oils a n d | compounds. F o r applications, working characteristics and list prices, | write for Bulletin 43-AC.
LEYBOLD MERCURY EJECTORS a n d DIFFUSION PUMPS The Model Hg 3 mercury diffusion pump reaches its2 full pumping speed at pressures below 10- 5mm. H g and remains constant down to 10- mm. Hg. The mercury ejectors models H g 12 and H g 45 reach maximum1 pumping2 speed at pressures between 10- and 10- mm. H g . Specially designed jets permit constant pumping speed at pressures between 10- 3 and 10- 5 mm. Hg. The pumps begin t o operate at considerably higher pressures. The ultimate vacuum is better than 10-e mm. Hg. We welcome your inquiries on this equipment and the accessories for it. Write for Bulletin 44-AC.
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ANALYTICAL CHEMISTRY
developments in laboratory equipment and instrumentation. Further information regarding rules for submittal of papers for consideration may be obtained from Ε. Μ. DuBois, program chairman, Spectrochemical Laborato ries, Inc., 1010 Wood St., Pittsburgh 21, Pa.
M o l e c u l a r Spectroscopy Conference P l a n n e d
JAMES G. BIDDLE CO. • SPEED
Robert J. Koegel, National Institutes of Health, received a $ 5 0 0 a w a r d in recognition of his achievements in the field of infrared spectroscopy. H e has designed a number of instruments which a r e now in routine commercial laboratory use
The second Conference on Molecular Spectroscopy will be held by the Spec troscopic Panel of the Institute of Petroleum's Hydrocarbon Research Group in London, Feb. 26 and 27, 1958. The meeting will cover new tech niques and recent developments in in strumentation in the field of spec troscopy. Topics to be discussed are: nuclear magnetic resonance, technical developments, intermole cular forces, and factors affecting intensities of ab sorption bands. There will also be a discussion on organization of spectro scopic services in the industrial labora tory. Contributed papers will be by invita^ tion only and will be preprinted for circulation before the meeting. Further information may be obtained from E. Thornton, secretary, I P Spectroscopic Panel, c/o British Petroleum Co., Ltd., Chertsey Rd., Sunbury-on-Thames, Middlesex, England.
