. Bell telephone magazine . son 124 Romance of the machine—A Book Review, par R. T. Barrett 151 Notes sur les événements récents 158 JUILLET 1930 passage de l'opération manuelle à l'opération de numérotation, par K. W. Waterson 163 World-Wide Telephony, Par Elam Miller 169 le service de marques de commerce dans les annuaires téléphoniques classifiés contribue au merchandising moderne, par H. W. MacNair 198 le premier tableau de commutation téléphonique et sa méthode de fonctionnement, par G. K. Thompson et R. B. Hill 205 Worlds Telephone Statistics, le 1er janvier 1929, par C. /. Koukol 212 Notes sur les événements récents 224 OCTOBRE 1930 coopération internationale à Telephon
1299 x 1923 px | 22 x 32,6 cm | 8,7 x 12,8 inches | 150dpi
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. Bell telephone magazine . son 124 Romance of the Machine—A Book Review, by R. T. Barrett 151 Notes on Recent Occurrences 158 JULY, 1930 Change from Manual to Dial Operation, by K. W. Waterson 163 World-Wide Telephony, by Elam Miller 169 Trade Mark Service in Classified Telephone Directories Contributes to Modern Merchandising, by H. W. MacNair 198 The First Telephone Switchboard and Its Method of Operation, by G. K. Thompson and R. B. Hill 205 Worlds Telephone Statistics, January 1, 1929, by C. /. Koukol 212 Notes on Recent Occurrences 224 OCTOBER, 1930 International Co-operation in Telephony, by H. E. Shreeve and H. S. Osborne 239 1930 Stock Offer of the American Telephone and Telegraph Company, by H. Blair-Smith 250 Bell System Sales Activities, hy H. C. Lauderback 262 An Intercommunicating System for Homes and Offices, by C. J. Da-vidson and A. Tradup 2 70 Significant Features of the Early Census Returns, hy R. L. Tomblen 21A Notes on Recent Occurrences 287 -^» .J 2 J o!f , » n« S ?^A. 2 o ii 4#„ 2 2. Bell TelephoneQuarterly A Medium of Suggestionand a Record of Progress CONTENTS FOR JANUARY 1930 PAGE Prosperity—Walter S. Gifford 3 Communication Facilities in the Making—R. T. Barrett l4 Operating Features of the Straightforward Trunking Method—F, S. Jamesand W. E. Farnham 25 Communications for Aviation—R. W. Armstrong 39 International Radio Technical Conference at the Hague—Lloyd Espen-schied 47 Abstraas of Technical Papers 53 Notes on Recent Occurrences 64 VOL. IX NO. 1 PUBLISHED QUARTERLY FOR THE BELL SYSTEM BY THE AMERICAN TELEPHONE AND TELEGRAPH COMPANY. SUBSCRIPTION, $1.50 PER YEAR, IN UNITED STATES AND CANADA; SINGLE COPIES, 50 CENTS Address all communications to INFORMATION DEPARTMENTAMERICAN TELEPHONE AND TELEGRAPH COMPANY 195 Broadway, New York CONTRIBUTORS TO THIS ISSUE WALTER S. GIFFORD President, American Telephone and Telegraph Company.Mr. GifFords address on Prosperity was delivered before theChicago Association of Commerce on Dec
