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Robert J. K o e g e l (left), National Cancer In stitute, e x p l a i n s fea tures o f r o t a r y Kjeldahl digestion a p p a r a tus (American Instru ment Co.) he helped design, to Elizabeth G . Frame, NIH, a n d Leon a r d H. B o l z , N a t i o n a l Bureau of Standards. S e v e r a l c h a n g e s in the instrument w e r e incor p o r a t e d at the sugges tion o f the Committee on Microchemical A p paratus of the ACS Division o f Analytical Chemistry
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Completely self-contained in waterproof ever-ready case with shoulder strap, Instrument s i z e : 3 χ SYz χ VA inches Case s i z e : 3 % χ bVz χ 4 Va inches Weight w i t h accessories: 3 lbs. Permits.continuous, direct reading pf p H . No buttons to hold down or dials to-,turn!
Analytical Measurements, Inc. 585 M A I N ST.
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t a r y and should not be divorced from one another. R a t h e r , t h e y should be used to cross reference each other, with each contributing- its obvious advantages t o t h e final conclusion. I n t h e symposium on methodology a n d instrumentation in microanalysis, Alsoph H . Corwin, J o h n s Hopkins, dis cussed the design and construction of a new microbalance. H e hopes t h a t it will eliminate m a n y of t h e previous sources of error which h a v e occurred. I t is housed in a double sheath of alumi num, is free from relative h u m i d i t y a n d t e m p e r a t u r e changes', and has incorpo rated a special device which makes it free from vibration. Balance uses specially fabricated materials and is designed and constructed b y techniques developed b y him over a period of 20 years. H e has t a k e n especial pains in constructing t h e balance t o incorporate strain-relief de vices. An electronic device which can obtain d a t a on the configuration of individual molecules was described b y Raold Wangsness, N a v a l Ordnance Labora tory, W h i t e Oak, M d . Wangsness says he uses the technique of nuclear m a g netic resonance to measure q u a d r u p l e m o m e n t s of molecules. C o m m e n t s b y others after the paper h a d been deliv ered said the a p p a r a t u s was a b o u t "one step removed from visualization of the actual molecule." Some of the instruments on display a t t h e exhibit included a recording spec trophotometer b y B e c k m a n I n s t r u m e n t s . I t automatically records t h e light absorption spectra of a sample a n d enables the operator to m a k e a closer de termination of the chemical composition of the sample. F a r r a n d Optical showed a n improved electron microscope which permits magnification to 200,000-plus diameters, gives high resolution, a n d costs $12,500 to build.
Glycerol Determination T h e Uniform M e t h o d s C o m m i t t e e of the American Oil Chemists' Society h a s recommended t h a t : The acetin method for glycerol, E a 4-38, and the dichromate method for glycerol, E a 5-38, be removed from AOCS official methods. T h e sodium periodate method for glyc erol, Ea 6-51, be retained as the only AOCS official method for glycerol, with minor changes. T h e recommendations were approved b y t h e society a t its April 1954 meeting.
100,000th Scientific Instrument C o m m e m o r a t i n g t h e production of t h e 100,000th i n s t r u m e n t — a recording spectrophotometer—by B e c k m a n in struments, Inc., South Pasadena, Calif., Arnold O. Beckman, president, pre sented a gold nameplate t o R. Francis Faull, m a n a g e r of t h e California Re search Corp.'s La H a b r a Laboratory, where t h e i n s t r u m e n t will be used in research on petroleum hydrocarbons.
Exhibit of Physical Society T h e exhibition of t h e Physical Society opened April 8 a t t h e Imperial College of Science a n d Technology, London, England. A m o n g t h e scientific instru m e n t s and a p p a r a t u s was the "flying s p o t " microscope which uses television t o magnify t o a n e x t e n t t h a t rivals t h e electron microscope. T h e pitch indi cator developed b y Kelvin H u g h e s gives t h e pilot an exact reading of the nose elevation of his aircraft during take-off. Photographic representations of t h e electron density in a crystal were shown b y t h e Crystallographic D e p a r t i n e n t of the Cavendish L a b o r a t o r y , C a m b r i d g e . A micro hardness tester for rubber A N A L Y T I C A L
C H E M I S T R Y
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