VOLUME XXVIII APRIL, 1949 NO. 2 



THE BELL SYSTEM 



TECHNICAL JOURNAL 



Ol 



'It 



DEVOTED TO THE SCIENTIFIC AND ENGINEERING ASPECTS 

 OF ELECTRICAL COMMUNICATION 



A Carrier System for 8000-Cycle Program Transmission 



R. A. Leconte, D. B. Penick, C. W. Schramm, A. J. Wier 165 



Delay Equalization of Eight-Kilocycle Carrier Program 

 Circuits C. H. Dagnall and P. W. Rounds 181 



Band Pass Filter, Band Elimination Filter and Phase Simu- 

 lating Network for Carrier Program Systems 



F. S. Farkas, F. J. Hallenbeck, F. E. Stehlik 196 



A Precise Direct Reading Phase and Transmission Measur- 

 ing System for Video Frequencies 



D. A. Alsberg and D. Leed 221 



Physical Principles Involved in Transistor Action 



J. Bardeen and W. H. Brattain 239 



Lightning Current Observations in Buried Cable 



H. M. Trueblood and E. D. Sunde 278 



The Electrostatic Field in Vacuum Tubes with Arbitrarily 



Spaced Elements W.R. Bennett and L. C. Peterson 303 



Transconductance as a Criterion of Electron Tube 



Performance T. Slonczewski 315 



Abstracts of Technical Articles by Bell System Authors .... 329 



Contributors to this Issue 332 



AMERICAN TELEPHONE AND TELEGRAPH COMPANY 



NEW YORK 



504 per copy S^-^O P^r ^^^^ 



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