. Bell telephone magazine . SINGLE COPY/; PER YEAR-- $150 -- / OCTOBER, 1933 TABLE OF CONTENTS The Engineer and a Century of ProgressH. P. Charlesworth The Vacuum Tube in Telephone CommunicationD. K. Gannett The Development of the Western Electric AudiphoneA. N. Holden The Growth of Americas Communication NeedsR. T. Barrett Certain Significant Features of the Census ofDistribution Dorothy Bolles U^^AMERICAN TELEPHONE &TELEGRAPH CO. NEW YORK. I Bell TelephoneQuarterly A Medium of Suggestionand a Record of Progress CONTENTS FOR OCTOBER 1933 PAGE The Engineer and a Centuty of Progress—H. P. Charl
. Bell telephone magazine . SINGLE COPY/; PER YEAR-- $150 -- / OCTOBER, 1933 TABLE OF CONTENTS The Engineer and a Century of ProgressH. P. Charlesworth The Vacuum Tube in Telephone CommunicationD. K. Gannett The Development of the Western Electric AudiphoneA. N. Holden The Growth of Americas Communication NeedsR. T. Barrett Certain Significant Features of the Census ofDistribution Dorothy Bolles U^^AMERICAN TELEPHONE &TELEGRAPH CO. NEW YORK. I Bell TelephoneQuarterly A Medium of Suggestionand a Record of Progress CONTENTS FOR OCTOBER 1933 PAGE The Engineer and a Centuty of Progress—H. P. Charlesuorth . . ,229 The Vacuum Tube in Telephone Communication—D. K. Gannett . 240 The Development of the Western Electric Audiphone—A. N. Ho/den . 251 i The Growth of Americas Communication Needs—R. T. Barrett . . 259 Certain Significant Features of the Census of Distribution —Dorothy Bolks 270 VOL. XII NO. 4 PUBLISHED QUARTERLY FOR THE BELL SYSTEM BY THE ANfERICAN TELEPHONE AND TELEGRAPH COMPANY. SUBSCRIPTION, PER YEAR, IN UNITED STATES; SINGLE COPIES, 50 CENTS Address all communications to INFORMATION DEPARTMENTAMERICAN TELEPHONE AND TELEGRAPH COMPANY 195 Broadway, New York CONTRIBUTORS TO THIS ISSUE H. P. CHARLESWORTH Massachusetts Institute of Technology, , 1905; Engineering Depart-ment, American Telephone and Telegraph Company, 1905-1919; Equip-ment and Transmission Engineer, Department of Operation and E
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