THE BELL SYSTEM" 



TECHNICAL JOURNAL 



VOLUME XVI, 1937 



Table of Contents 

 January, 1937 



A Million-Cycle Telephone System — AI. 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 Function of a Radiating Dipole at the Earth's 



Surface— 5. O. Rice 101 



Technical Digest — 



Currents and Potentials along Leaky Ground-Return Con- 

 ductors — E. D. Sunde 110 



April, 1937 



Recent Trends in Toll Transmission in the United States — 



Edwin H. Colpitis 119 

 Crosstalk Between Coaxial Transmission Lines — 



6'. A . Schelkunoff and T. M. Odarenko 144 



Sound Recording on Magnetic Tape — C. N. Hickman 165 



Constant Resistance Networks with Applications to Filter 



Groups — E. L. Norton 178 



A Laboratory Evaluation of Wood Preservatives — 



R. E. Waterman, John Leutritz and Caleb M. Hill 194 

 Study of Magnetic Losses at Low Flux Densities in Permalloy 



Sheet— W^. B. Ellwood and V. E. Legg 212 



Moisture in Textiles — Albert C. Walker 228 



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