• «• 



THE BELr'SrstEM* 



TECHNICAL JOURNAL 



A JOURNAL DEVOTED TO THE 



SCIENTIFIC AND ENGINEERING 



ASPECTS OF ELECTRICAL 



COMMUNICATION 



EDITORIAL BOARD 



F. R. Kappel O. E. Buckley 



H. S. Osborne M. J. Kelly 



J. J. PiLLioD A. B. Clark • 



R. BOWN D. A. QUARLES 



F. J. Feely 

 P. C. Jones, Editor M. E. Strieby, Managing Editor 



TABLE OF CONTENTS 



AND 



INDEX 

 VOLUME XXX 



1951 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 

 NEW YORK 



