THE PERKIN - ELMER INSTRUMENT DIGEST - Chemical

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THE

PERKIN-ELMER

INSTRUMENT DIGEST A c o n d e n s a t i o n of s o m e of the a r t i c l e s a p p e a r i n g in t h e S p r i n g issue of THE PERKIN-ELMER INSTRUMENT NEWS, a quarterly p u b l i c a t i o n o f The PerkinElmer C o r p o r a t i o n , m a n u f a c t u r e r s of scientific instruments — I n f r a r e d S p e c ­ t r o m e t e r s , Tiselius E l e c t r o p h o r e s i s A p p a r a t u s , U n i v e r s a l M o n o c h r o m a t o r ,

Glenbrook, Conn.

Flame P h o t o m e t e r s , Continuous I n f r a r e d A n a l y z e r , L o w - l e v e l A m p l i f i e r s —as w e l l as A s t r o n o m i c a l Equipment, R e p l i c a G r a t i n g s , T h e r m o c o u p l e s , Photo­ g r a p h i c Lenses, C r y s t a l O p t i c s , a n d S p e c i a l Instruments for the g o v e r n m e n t . For further i n f o r m a t i o n , w r i t e T h e Perkin-Elmer C o r p . , G l e n b r o o k , C o n n .

Vol. I, No. 10

June, 1950

ENFRARED MEASURES FLAME TEMPERATURE The need for a rapid, accurate, prac­ tical m e t h o d of flame t e m p e r a t u r e meas­ u r e m e n t has arisen with the development of ram jets, t u r b o jets, and rockets. Many believe the a n s w e r to this need will be In­ frared M o n o c h r o m a t i c Radiation pyrometry—IMRA—which c a n m e a s u r e the tem­ peratures of flames five feet in diameter reaching 5000° F . , with an accuracy ap­ proaching ± 1 % . Infrared radiation from a source of known emission is passed t h r o u g h the gas stream, focused o n the entrance slit of a P e r k i n - E l m e r Infrared Monochromator, a n d the radiant energy at a certain wave­ length m e a s u r e d a n d recorded. T w o meas­ u r e m e n t s are m a d e , with shutters in and o u t of the b e a m , giving two equations in t w o u n k n o w n s which, when solved, give t h e gas stream t e m p e r a t u r e .

SECONDHAND INFRARED SPECTROMETERS Perkin-Elmer is willing to act as a clear­ ing house for prospective buyers and sell­ ers of any m a k e used spectrometers, and t o provide q u o t a t i o n s on renovating and m o d e r n i z i n g our own used instruments. Prospective p u r c h a s e r s of used instru­ ments, as well as a n y o n e with infrared spectrometers they wish to sell, should c o m m u n i c a t e with T h e Perkin-Elmer Cor­ p o r a t i o n at G l e n b r o o k , C o n n .

You can receive t h e complete publication f r o m w h i c h those articles w e r e d i g e s t e d .

MODEL 12-C INFRARED SPECTROMETER IMPROVED

Write The Perkin-Elmer Corporation, Glen­ brook, Conn., and you w i l l receive regularly THE PERKIN-ELMER INSTRUMENT NEWS-an 8-page quarterly devoted exclusively to news of the latest advances in electro-optical in­ s t r u m e n t a t i o n . Here are some of the features of the current issue: EUROPEAN APPLICATIONS OF ELECTROPHORESIS

page 1

INSTRUMENTATION IN THE HOSPITAL CLINICAL LABORATORY

3

ABSTRACTS OF CURRENT LITERATURE

5

FIVEPOSITIOIS

CELL

SLIDE

F o r rapid c o m p a r i s o n s of a s a m p l e with as m a n y as four s t a n d a r d s of graded con­ centrations. It is also particularly useful in t h e d e t e r m i n a t i o n of trace impurities where it is a d v a n t a g e o u s to depress the zero below the lower limit of the Brown recorder so that a small absorption band m a y be blown up t o a relatively large de­ flection. C o m p a r i s o n s m a y be m:\de be­ tween t h e sample and graded impurity concentrations in t h r e e or four of the cells. T h e cell slide is a plate, with five attached vertical cell-holders, m o u n t e d in a hori­ zontal slide, permitting any of the five cells to be placed in the optical path with accu­ rate r e p r o d u c t i o n of position. Accessory No. 12-0103 for Model 12-C Infrared Spectrometers.

A new metal cabinet, faster recorder, and an improved wavelength drive a r e a m o n g the i m p r o v e m e n t s developed for the P e r k i n - E l m e r M o d e l 12-C Infrared Spectrometers. O u t s t a n d i n g features of the n e w cabinet are rugged construction, c o m p a c t n e s s a n d easy mobility, permitting the entire casterm o u n t e d unit to pass easily t h r o u g h ordi­ nary industrial d o o r s . C o n t r o l s a n d r e ­ c o r d e r are readily accessible t o the oper­ ator. Overall dimensions of the cabinet a r e 4 6 " high χ 5 4 " long χ 3 0 " wide. All future model 12-C instruments will include the two-second Leeds & N o r t h r u p " S p e e d o m a x G " recorder as s t a n d a r d equipment. T h e new wavelength drive has simpli­ fied speed-change controls a n d is c o m ­ pletely reversible.

INFRARED SPECTRUM OF CORTISONE ACETATE (MERCK)

4r ν

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SAMPLE co#r/so//£i . ACETATE CMERCK)\

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Omm

L „ F « M « M BREAKS

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~ i _ î Qf EXTREME^ __' "-' : SOLVENT . _ 1 ABSORPTION t

Infrared spectrum of cortisone (Compound E) acetate. The spectrum was obtained on a Perkin-Elmer Model 21 Infrared Spectrometer, using a 1 mm sample microcell and a variable space reference cell ( I N S T R U M E N T N E W S , Vol. 1, No. 2), to compensate for the solvent chloroform absorp-

VOLUME

2 8,

NO.

26

JUNE

2 6,

tion. The gaps in the spectrum represent regions where the CHCl.i absorption is too strong to permit valid solute results. A higher resolution spectrum on a diluted sample was run in the unsaturate region. The rise in transmission from 1-2 μ is caused by sample cell scattering.

1950

2195