THE BELL SYSTEM TECHNICAL JOURNAL 



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. Belcher 



Treasurer 



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EDITORIAL BOARD 



F. R. Kappel 

 H. S. Osborne 

 J. J. PilUod 

 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. 



