THE BELL SYSTEM TECHNICAL JOURNAL 



ADVISORY BOARD 



F. R. KAPPEL, President, Western Electric Company 



M. J. KELLY, President, Bell Telephone Laboratories 



E. J. McNBELY, ExecutivB Vice President, American 

 Telephone and Telegraph Company 



EDITORIAL COMMITTEE 



B. MCMILLAN, Chairman 



A. J. BUSCH 



A. C. DICKIESON 



B. L. DIETZOLD 

 K. E. GOULD 



E. I. GREEN 



R. E. HONAMAN 

 H. R. HUNTLEY 



F. R. LACK 

 J. R. PIERCE 

 H. V. SCHMIDT 



G. N. THAYER 



EDITORIAL STAFF 



J. D. TEBO, Editor 



M . E. 8TRIEBY, Managing Editor 



R. L. SHEPHERD, Prodvction Editor 



THE BELL SYSTEM TECHNICAL JOURNAL is pubUshed six timea a year 

 by the American Telephone and Telegraph Company, 195 Broadway, New York 

 7, N. Y. Cleo F. Craig, President; S. Whitney Landon, Se<»etary; 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» 



