520 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



A JOURNAL DEVOTED TO THE 



SCIENTIFIC AND ENGINEERING 



ASPECTS OF ELECTRICAL 



COMMUNICATION 



EDITORIAL BOARD 



J. J. Carty Bancroft Gherardi F. B. Jewett 



E. B. Craft L. F. Morehouse O. B. Blackwell 



H. P. Charlesworth E. H. Colpitts 



R. W. King— Editor. 



VOLUME II 

 1923 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 

 NEW YORK 



Reprinted with the permission of the American Telephone 

 and Telegraph Company, New York 



JOHNSON REPRINT CORPORATION 



111 Fifth Avenue, New York, N. Y. 10003 



JOHNSON REPRINT COMPANY LIMITED 

 Berkeley Square House, London, W.l 



