1>>>')^ J33 



THE BELL SYST'Ej 



TECHNICAL JOURNAL 



A JOURNAL DEVOTED TO THE 



SCIENTIFIC AND ENGINEERING 



ASPECTS OF ELECTRICAL 



COMMUNICATION 



EDITORIAL BOARD 



Bancroft Gherardi H. P. Charlesworth F. B. Jewett 



A. F. Dixon O. E. Buckley O. B. Blackwell 



D. Levinger M. J. Kelly H. S. Osborne 



W. Wilson 

 R. W. King, Editor J. O. Perrine, Associate Editor 



TABLE OF CONTENTS 



AND 



INDEX 



VOLUME XVI 

 1937 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



