38A
ANALYTICAL
CHEMISTRY
ANNOUNCING A NEW INSTRUMENT for research and routine
POLAROGRAPHY
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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.
USES Metals Alloys Ores Plating solutions Boiler water Corrosion studies Paints
Sheet, Wire, Tubing, Gauze and Fine Foils.
Explosives
Laboratory Wares of all description.
Petroleums Gasoline Oils a n d soaps Sugar products Dyestuffs Albumins Amino acids Alcohols Ketones Serums
Stills, Retorts, Electrodes and other Special Process Equipment to order. Salts and Solutions. Platinum Metal Catalysts — Concentrated forms and on carriers. Palladium, Iridium, Osmium, Rhodium and Ruthenium.
Proteins
We pay highest prices for scrap platinum and have facilities for prompt recovery of spent platinum and palladium catalysts.
Alkaloids
•
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.
Blood Urine Hormones Colloids Kinetics Reaction rates Equilibria Catalysis Diffusion
^ For more information write for Bulletin 6 5 1 . Distributed by
General Scientific Equipment Co. Homden 14
Connecticut
WE INVITE YOUR INQUIRIES AND WILL SEND ON REQUEST FOLDERS: C-20, "Platinum, Gold & Silver for Science, Industry & the Arts' C-21, "Platinum and Palladium Catalysts".
THE A M E R I C A N PLATINUM WORKS PRECIOUS M
SINCES J ^ 1875 J
2 3 1 N E W
JERSEY R.R.AVE., NEWARK 5, N. J.
