BELL SYSTEM TECHNICAL JOURNAL 



July, 1933 



Carrier in Cable— ^. B. Clark and B. W. Kendall 251 



Mutual Impedance of Grounded Wires Lying On or Above the 



Surface of the Earth— i?owaW M. Foster 264 



Contemporary Advances in Physics, XXVI — The Nucleus, First 



Part — 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 — 



T. G. Castner and C. W. Carter, Jr. 347 



October, 1933 



Loudness, Its Detinition, Measurement and Calculation — 



Harvey Fletcher and W. A. Munson 377 

 Effect of Atmospheric Humidity and Temperature on the Relation 

 between Moisture Content and Electrical Conductivity of 



Cotton— Albert C. Walker 431 



Classification of Bridge Methods of Measuring Impedances— 



John G. Ferguson 452 

 Some Theoretical and Practical Aspects of Noise Induction — 



R. F. Davis and H. R. Huntley 469 

 Audio Frequency Atmospherics — 



E. T. Burton and E. M. Boardman 498 

 Certain Factors Limiting the Volume Efficiency of Repeatered 



Telephone Circuits — Leonard Gladstone Abraham 517 



