THE BELL SYSTEM 



TECHNICAL JOURNAL 



VOLUME XVII, 1938 



Table of Contents 

 January, 1938 



New Transmission Measuring Systems for Telephone Circuit 



Maintenance — F. H. Best 1 



The Impedance Concept and its Application to Problems of 

 Reflection, Refraction, Shielding and Power Absorption — 



5. A. Schelkunoff 17 

 On the Theory of Space Charge Between Parallel Plane Electrodes 



— C. E. Fay, A. L. Samuel and W. Shockley 49 

 A Carrier Telephone System for Toll Cables — 



C. W. Green and E. I. Green 80 

 Cable Carrier Telephone Terminals — 



R. W. Chesnut, L. M. Ilgenfritz and A. Kenner 106 

 Crystal Channel Filters for the Cable Carrier System — 



C. E. Lane 125 

 Crosstalk and Noise Features of Cable Carrier Telephone System 



"^M. A. Weaver, R. S. Tucker and P. S. Darnell 137 

 A New Single Channel Carrier Telephone System — 



H. J. Fisher, M. L. Almquist and R. H. Mills 162 



April, 1938 



Studies of Telephone Line Wire Spacing Problems — 



/. A. Carr and F. V. Haskell 195 



Variable Equalizers— iJ. W. Bode 229 



An Explanation of the Common Battery Anti-sidetone Sub- 

 scriber Set — C. 0. Gibbon 245 



The Occurrence and Effect of Lockout Occasioned by Two Echo 



Suppressors — Arthur W. Horton, Jr 258 



Characteristic Time Intervals in Telephonic Conversation — 



A. C. Norwine and O. J. Murphy 281 



Radioactivity — Artificial and Natural — Karl K. Darrow 292 



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