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
