NATIONAL CARBON COMPANY

nets. Using a spark solution method with hollow, porous electrode, and calibrating by means of synthe- tic solution standards, fast, uniformly accurat...
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UNUSUAL

APPLICATIONS

OF

S Ρ Ε C Τ R Ο G RAP H I C

ANALYSIS

MANUFACTURING LABORATORY-CONTROL AT SPERRY GYROSCOPE • Long-time user of spectrographs analysis, Sperry Gyroscope of Great Neck, Ν . Υ., naturally turned to this method when confronted with the problem of distinguishing between various types of Alnico mag­ nets. Using a spark solution method with hollow, porous electrode, and calibrating by means of synthe­ tic solution standards, fast, uniformly accurate results were obtained. Sperry now successfully employs this same method to analyze nickel-iron, high-permeability, magnetic alloys and to establish standards used in routine spark analysis for minor elements in silicon-bronze alloy. In addition to these rather uncommon uses of spectroscopy, Sperry regularly employs standard spark methods for quality-control analysis of ingot and cast­

ing heats in their own foundry; also for identification and composition checks on purchased alloys, includ­ ing precious metals for electrical contacts. Time required for such tests averages one-twentieth of that needed for chemical methods.

Have You A Job for the Spectrograph ? If so, be sure you specify "National" spectroscopic electrodes in either preformed shapes or rods. They are the purest obtainable and are accompanied by a "statement of purity" which tells precisely which trace-elements are present. Your analyst is thus fore­ warned against errors arising from unexpected spec­ tral lines.

"The term "National'' is a registered trade-mark of Union Carbide and Carbon Corporation

N A T I O N A L CARBON

COMPANY

A Division of Union Carbide and Carbon Corporation 30 East 42nd Street, New York 17, Ν. Υ.

"NATIONAL" SPECTROSCOPIC

ELECTRODES

Sales Offices: Atlanta, Chicago, Dallas, Kansas City, Los Angeles, New York, Pittsburgh, San Francisco I N CANADA: Union Carbide Canada Limited, Toronto

For further information, circle number 30 A on Readers' Service Card, page 49 A

30 A

ANALYTICAL

CHEMISTRY