THE BELL SYSTEM TECHNICAL JOURNAL 



Published quarterly by the 



American Telephone and Telegraph Company 



195 Broadway J New York, N. Y- 





EDITORS 

 R. W. King J. O. Perrine 



EDITORIAL BOARD 



W. H. Harrison 

 O. B Blackwell 

 H. S. Osborne 

 J. J. PiUiod 



O. E. Buckley 

 M. J. KeUy 

 A. B. Clark 

 S. Bracken 



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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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Copyright, 1947 

 American Telephone and Telegraph Company 



PRINTED IN U. S A 



