THE BELL SYSTEM TECHNICAL JOURNAL 



Published quarterly by the 



American Telephone and Telegraph Company 



195 Broadway^ New York, N, F. 



■ » » » .^i^i^ii^-^iii^ 



EDITORS 

 R. W. King J. O. Perrine 



F. B. Jewett 

 O. £. Buckley 

 S. Bracken 



EDITORIAL BOARD 



M. R. Sullivan 

 A. B. Clark 

 M. J. KeUy 



O. B. Blackwell 



H. S. Osborne 

 F. A. Cowan 



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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. 



Copyright, 1944 

 American Telephone and Telegraph Company 



PRINTED IN U. S. A. 



