ANALYTICAL
32 A
CHEMISTRY
PETERSON
ANNOUNCING A NEW INSTRUMENT
OUTS OUT5I*—
for research and routine
M O R
Y
POLAROGRAPHY
J&?V-'
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Instrument Designed to fill the growing need for a precise, reliable and stable manual polarographic instrument . . . will measure all the fundamental charac teristics of a d r o p p i n g m e r c u r y electrode system (such as half-wave potentials and diffusion currents) in absolute terms and with high preci sion. Such a calibrated instrument is of utmost importance in routine work when complete waves are not obtained. It may also be used as an accurate potentiometer wherever an electrometer is not necessary. O N L Y instrument with all these features : •
25 turn helical potentiometer ac curate to 0 . 1 % , reading to one millivolt with a span voltage of 2.5 v. — and to double this value at a span voltage of 5.0 v.
•
Self-contained standard cell and standard resistors for calibrating.
•
Low resistance galvanometer with sensitivity approximating 0.005 microamperes per millimeter. Multiple shunt from 1 χ to 300 x. Scale length: 320 mm.
&l
UW*
USES Metals Alloys Ores
Distributors located throughout the United States
LEONARD P E T E R S O N&CO.,INC. 1230 FULLERTON AVENUE
CHICAGO
14,
ILLINOIS
solutions Boiler water Corrosion studies Paints Explosives Petroleums Gasoline Oils and soaps Sugar products Dyestuffs Albumins Amino acids Alcohols Ketones Scrum* Proteins Alkaloids Blood Urine Hormones Colloids Kinetics Reaction rates Equilibria Catalysis
For more information write for Bulletin 6 5 1 . Distributed by
General Scientific Equipment Co. 14
1*-°,
Plating
Diffusion
Hamden
^
From coast to coast, leading laboratories recognize Peterson's reputation for qual ity furniture for laboratory, and library. Whatever your requirements may be, call on Peterson's experts for an economical solution to your problems . . . No o b l i g a tion is incut red.
Connecticut
FRUSTROSnr CASE No. 43:
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to any problem from less than one to 32,000,000 cent/poises. Ask y o u r L a b S u p p l y H o u s e o r d r o p a l i n e t o D e p t . B , Brookfield E n g i n e e r i n g L a b o r a t o r i e s , Inc., S t o u g h t o n , M a s s . χ / y «FRUSTROSITY is that frustrated condition a man gets into ( &r when his problem is Viscosity Determination or Control m and he hasn't asked BROOKFIELD.
