I ot =t I 



VOLUME XXVIII 



JULY, 1949 NO. 3 



THE BELL SYSTEM ^*% 



TECHNICAL JOURNAL 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



Editorial Note regarding Semiconductors 335 



Hole Injection in Germanium — Quantitative Studies and 

 Filamentary Transistors 



W. Shockley, G. L. Pearson, J. R. Haynes 344 



Some Circuit Aspects of the Transistor 



R. M. Ryder and R. J. Kircher 367 



Theory of Transient Phenomena in the Transport of Holes 

 in an Excess Semiconductor Conyers Herring 401 



On the Theory of the A-C. Impedance of a Contact Rectifier 



J. Bardeen 428 



The Theory of p-n Jimctions in Semiconductors and p-n 

 Junction Transistors W, Shockley 435 



Band Width and Transmission Performance 



C. B. Feldman and W. R. Bennett 490 



Abstracts of Technical Articles by Bell System Authors 596 



Contributors to this Issue 599 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



50^ per copy |J.5Q per Year 



