Teelm.Iaia ]Aumal of Tel and Telegraph Carporati
J;I1�©'1rIDJI�I1 oo���n�1rll©� Teelm.iaiA ]aumal ofthe 1*1'rWtiaRal Tel� and Telegraph Carporati� and Assa eia.te Compa.aitls COLO&.·TELETISION TRANSMITrER FOR 491 MEGACYCLE$ P SQUARE LOO S FOR FRlllQUENCY-MOOlJLATED BDOADCASTING TRIOD:il AMPLIFICATION FACTORS ATTENUATION AND Q FACTOR'S IN .WAVE. GUIDES PIEZfiELE£TRI£ SIIUTAl�l::ES RECENT TELE£0M.Ml1NICA'I'ION. DEVELOPMENTS DECEl\IBEB, 1946 VOL. 23 No.. 4 www.americanradiohistory.com ELECTRICAL COMMUNICATION Technical Journal of the INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION and Associate Companies H. T. KoHLHAAS, Editor A F. J. M NN, Managing Editor H. P. WESTMAN, Associate Editor REGIONAL EDITORS E. G. PoRTS, Federal Telephone and Radio Corporation, Newark, New Jersey B. C. HoLDING, Standard Telephones and Cables, Ltd., London, England P. F. BouRGET, Laboratoire Central de Telecommunications, Paris, France H. B. Wooo, Standard Telephones and Cables Pty. Ltd., Sydney, Australia EDITORIAL BOARD H. Busignies H. H. Buttner G. Deakin E. M. Deloraine W. T. Gibson Sir Frank Gill W. Hatton E. Labin E. S. McLarn A. W. Montgomery Haraden Pratt G. Rabuteau F. X. Rettenmeyer T. R. Scott C. E. Strong E. N. Wendell W.K. Weston Published Quarterly by the INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION 67 BROAD STREET, NEW YORK 4, N.Y., U.S.A. Sosthenes Behn, President Charles D. Hilles, Jr., Vice President and Secretary Subscription, $r.50 per year; single copies, 50 cents Copyrighted 1946 by International Telephone and Telegraph Corporation Volume 23 December, 1946 Number 4 CONTENTS PAGE FEDERAL TELEPHONE AND RADIO CORPORATION 377 . • . • . • • • • A HISTORICAL REVIEW: 1909-1946 By F.
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