VOLUME XVI JANUARY, i9^Z ^^^^^ ^ 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTinC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



A Million-Cycle Telephone System — M. E. Strieby .... 1 



A Power Amplifier for Ultra-High Frequencies — 



A. L. Samuel and N. E. Sowers 10 



The Physical Reality of Zenneck's Surface Wave — 



W, Howard Wise 35 



Radio Propagation Over Plane Earth — ^Field Strength Curves — 



Charles R. Burrows 45 



The Inductive Coordination of Common-Neutral Power Distri- 

 bution Systems and Telephone Circuits — 



J. O'R. Coleman and R. F. Davis 76 



Series for the Wave Ftmction of a Radiating Dipole at the 

 Earth's Surface— S. O. Rice 101 



Technical Digest — 



Currents and Potentials along Leaky Ground-Return Conductors— 



E.D.SuTide 110 



Abstracts of Technical Papers 113 



Contributors to this Issue 116 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



50c per Copy $1.50 per Year 



