HE BELL SYSTEM 



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5 VOTED TO THE SCIENTIFIC ^^^ AND ENGINEERING 

 iPECTS OF ELECTRICAL COMMUNICATION 



NOVEMBER 1954 *' ^^*^* NUMBER 



>LUME XXXIII 



i"j ■ ». '■■.•\r 



DEC 2 1954 



Waveguide as a Communication Medium 8. b. miller 1209 



A Governor for Telephone Dials — Principles of Design 



W. PFERD 1267 



In -Band Single-Frequency Signaling 



A. WEAVER AND N. A. NEWELL 1S09 



Centralized Automatic Message Accounting System g. v. kino 1S31 

 The Wave Picture of Microwave Tubes j. r. pierce 1343 



Theory of Open-Contact Performance of Twin Contacts 



M. M. ATALLA AND MISS R. E. COX 1373 



I 



Bell System Technical Papers Not Published in this Journal 1387 



Recent Bell System Monographs 1392 



Contributors to this Issue 1398 



COPTBIGHT 1954 AMEHICAN TELEPHONE AND TELEGRAPH COMPANY 



