THE BELL SYSTEM TECHNICAL JOURNA 



Published quarterly by the 

 American Telephone and Telegraph Company 

 195 Broadway, New York 7, N. Y. 



Leroy A.Wilson 



President 



Carroll O. Bickelhaupt 



Secretary 



Donald R. Eelcher i 



Treasurer \ 



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EDITORIAL BOARD 



F. R. Kappel 

 H. S. Osborne 

 J. J. Pilliod 

 R. Bown 



O. E. Buckley 

 M. J. KeUy 

 A. B. Clark 

 D. A. Quarles 



F. J. Feely 

 J. O. Perrine, Editor P. C. Jones, Associate Editor 



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SUBSCRIPTIONS 



Subscriptions are accepted at $1.50 per year. Single copies are 50 cents each. 

 The foreign postage Is 35 cents per year or 9 cents per copy. 



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PRINTED IN U.S. A. 



