FOR VACUUM-DISTILLATION
nevaco The newest
addition
935
t o t h e Nevaco
line o f
vacuum p u m p s , t h e 935 offers a g u a r a n t e e d vacuum o f 0.015 m m o f mercury a n d a capacity o f 3 6 liters o f free a i r per minute a t 5 4 0 r p m
nevaco
The slower r p m assures longer life a n d less t e m p e r a t u r e extremes. The greater
is the new name for
all products monufaclured by:
p u m p i n g v o l u m e permits use o f larger vessels in t h e vacuum system, thus increasing p r o d u c t i o n capacity. Especially useful f o r pilot p l a n t a n d small p r o d u c t i o n runs w h e r e continuous o p e r a t i o n is r e q u i r e d . Price:
See your dealer o r w r i t e :
$120.00
NELSON VACUUM PUMP COMPANY 2133
Fourth
Street
•
Berkeley
10, C a l i f o r n i a
Circle No. 148 on Readers' Service Card
ANOTHER PROCEDURE X *Ref:SULFURIC ACID-INDUCED! MADE RELATIVELY SIMPLER FLUORESCENCE or S
CORTICOSTEROIDS MAX I. SWEAT, Anal. Chem. Vol. 26, Pg. 773 GALVANOMETER OEFLECTION
FARRAND®
Photoelectric FLUOROMETER T h e Farrand Photoelectric Fluoro m e t e r simplifies techniques a n d assures precise performance in fluorometric assay.
over a wide range of sensitivities for m e a s u r e m e n t s of e x t r e m e l y l o w c o n c e n t r a t i o n s i n m i c r o or macro v o l u m e s .
T h e instrument is designed t o ren der linear response and stability
U s e d by leading scientists through out the world.
BULLETIN
NO. 803R,
Engineering, Research Development, Design ond Manufacture of Precision Optics, Electronic and Scientific Instruments
with
list of users, sent upon
Emission Spectrum of Fluorescence Produced by 17- Hydroxycorticosterone in Etnanolic Sulfuric Acid Solution
request
FARRAND OPTICAL CO., INC. Bronx Boulevard and East 238th Street, New York 7 0 , Ν. Υ. Circle No. 140 on Readers' Service Card V O L . 3 1 , N O . 2 , FEBRUARY 1 9 5 9
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7 5 A
