VOLUME Xm APRIL, 1934 NUMBER 2 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTinC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



The Carbon Microphone: An Account of Some Re- 

 searches Bearmg on Its Action — F. S. Gaucher 163 



Open-Wire Crosstalk — A. G. Chapman 195 



Symposium on Wire Transmission of Symphonic Music 

 and Its Reproduction in Auditory Perspective : 



Basic Requirements — Harvey Fletcher .... 239 



Physical Factors— 7. C. Steinberg and W. B. Snow 245 



Loud Speakers and Microphones — E. C. Wente and 

 A. L. Thuras 259 



Amplifiers — f. O. Scriven 278 



Transmission Lines — H. A, Affel^ R. W. Chesnut 

 and R. H. Mills 285 



System Adaptation — E. H. Bedell and Iden Kerney 301 



Abstracts of Technical Papers 309 



Contributors to this Issue 313 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



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