THE BELL SYSTEM TECHNICAL JOURNAL 



ADVISORY BOARD 



A. B, GOETZE, President, Western Electric Company 



M. J. KELLY, President, BeU Telephone Laboratories 



E. J. McNEELY, Execviivc Vice President, American 

 Telephone and Telegraph Company 



EDITORIAL COMMITTEE 



B. McMillan, Chairman 



S, E. BRILLHART E. I.GREEN 



A. J. BUSCH R. K. HONAMAN 



L. R. COOK H. R. HUNTLEY 



A. C. DICKIE80N F. R. LACK 



R. L. DIETZOLD J. R. PIERCE 



K. E. GOULD G. N. THAYER 



EDITORIAL STAFF 



J. D. TEBO, 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. F. R. Kappel, President; S. Whitney Landon, Secretary; John J. Scan- 

 Ion, 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. 



