-J 



VOLUME XVI JULY, 1937 NUMBERS 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTinC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Scientific Research Applied to the Telephone Transmitter and 

 Receiver — Edwin H, Colpitis 251 



The Use of Coaxial and Balanced Transmission Lines in 

 Filters and Wide-Band Transformers for High Radio 

 Frequencies — W, P. Mason and R. A. Sykes .... 275 



A Ladder Network Theorem — John Riordan 303 



Contemporary Advances in Physics, XXXI — Spinning Atoms 

 and Spinning Electrons — Karl K. Darrow 319 



A Multiple Unit Steerable Antenna for Short- Wave Reception 



—H. T. Friis and C. B. Feldman 337 



Abstracts of Technical Papers 420 



Contributors to this Issue 422 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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