VOLUME xn JULY, 1933 



NUMBER 3 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Carrier in Cable— i4. B. Clark and B. W, Kendall . . 251 



Mutual Impedance of Grounded Wires Lying On or 



Above the Surf ace of the Earth— /?onaZc/ M. fosfer 264 



Contemporary Advances in Physics, XXVI— The 



Nucleus, First Pait—Karl K. Darrow .... 288 



A System of Effective Transmission Data for Rating 

 Telephone Circuits — 



F. W. McKown and J, W. Emling 331 



Developments in the Application of Articulation 



Testing— r. G. Castner and C. W. Carter, Jr. . . 347 



Abstracts of Technical Papers 371 



Contributors to this Issue ^-^^ 



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