VOLUME xvn JANUARY, 1938 number l 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMNOINICATION 



New Transmission Measuring Systems for Telephone Circmt 

 Maintenance — F. H. Best 1 



The Impedance Concept and its Application to Problems of 

 Reflection, Refraction, Shielding and Power Absorption 



— S. 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 



— /?. W. Chesnut, L. Af. Ilgenfriiz 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, Af. L. Almquist and R. H. Mills 162 



Abstracts of Technical Papers 184 



Contributors to this Issue 191 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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