THE BELL SYSTEM TECHNICAL JOURNAL 



ADVISORY BOARD 



F. K. K A P P E L, President Western Electric Company 



M. J. KELLY, President, Bell Telephone Laboratories 



E. J. McNEELY, Executive Vice President, American 

 Telephone and Telegraph Company 



EDITORIAL COMMITTEE 



B. MCMILLAN, Chairman 



A. J. BUSCH H. R. HUNTLEY 



A. C. DICKIBSON F. R. LACK 



R. L. DIETZOLD J. R. PIERCE 



K. E. GOULD H. V. SCHMIDT 



E. I. GREEN C. ESCHOOLEY 



R. K. HON AM AN G. N. THAYER 



ED ITORI AL STAFF 



J. D. TEBO, Editor 



M. E. s T R I E B Y, Managing Editor 



R. L. SHEPHERD, Production Editor 



THE BELL SYSTEM TECHNICAL JOURNAL is published six times 

 a year by the American Telephone and Telegraph Company, 195 Broadway, 

 New York 7, N. Y. Qeo F. Craig, President; S. Whitney Landon, Secretary; 

 John J. Scanlon, Treasurer. Subscriptions are accepted at $3.00 per year. 

 Single copies are 75 cents each. The foreign postage is 65 cents per year or 11 

 cents per copy. Printed in U. S. A. 



