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western Electric CompanyINCORPORATED

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Western Electric Company, Inc.

This Handbook, as indicated in the "Foreword," was prepared toassist Western Electric people in performing Western Electric Com-pany work. Others elsewhere may also think it useful as a guidefor applying statistical quality control. The Company has printeda limited number of copies beyond its own requirements to meetsuch interest. These copies are available at $7.50, postage paid.Inquiries may be addressed to Superintendent, Quality Assurance,Western Electric Company, Inc., 222 Broadway, New York N. Y.10038. The Handbook is not for sale through ordinary commercialchannels.

© 1956BY WESTERN ELECTRIC Co., INC.

First Edition 1956

Second Edition 1958

PRINTED IN THE UNITED STATES OF AMERICA

BY THE MACK PRINTING COMPANY, EASTON, PENNSYLVANIA