THE BELL SYSTEM TECHNICAL JOURNAL 



ADVISORY BOARD 



S. BRACKEN, President, Western Electric Company 



F. R. K A P P E L, Vice President, American Telephone 

 and Telegraph Company^ 



M. J. KELLY, President, Bell Telephone Laboratories 



EDITORIAL COMMITTEE 



E. I. GREEN, Chairman 



A. J. B U S C H F. R. L A C K 



W. H. DOHERTY J. W. MCRAE 



G. D. EDWARDS W. H. NUNN 



J. B. FISK H. I. ROMNES 



R. K. HONAMAN H.V.SCHMIDT 



EDITORIAL STAFF 



J. D. T E B O, Editor 



M. E. STRIEBY, 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. Cleo F. Craig, President; S. Whitney Landon, Secretary; 

 Alexander L. Stott, 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. 



