Radio broadcast .. (1922-30)

RADIO BROADCAST AUGUST, 1927 WILLIS KINGSLEY WING, Editor KEITH HENNEY EDGAR H. FELIX Director of the Laboratory Contributing Editor Vol. XI, No. 4 Cover Design From a Design by Harvey Hopkins Dunn Frontispiece - - - - The Broadcasting Station at Warsaw 198 Saving Paper! James Millen 199 The March of Radio An Editorial Interpretation 203 Revolutionary Methods Which Fail to Ma- Never Again Without Radio terialize Why We Need More Listeners The Commission Regulates Broadcasting for Unsnarling the Patent Tangle the Broadcasters Not the Listener " Canned " Programs, Good and Bad What Commissioner Bellows Thinks About The Month in Radio DX Listening Have You a Roberts Reflex? •••••• John B. Brennan 208 The Balsa Wood Loud Speaker - - - - The Laboratory Staff 211 A Flexible Short'Wave Transmitter - Howard E. Rhodes 213 The Listeners'Point of View John Wallace 218 Radio Is Doing a Good Job in Music Thumb Nail Reviews The " Continuity " Program Broadcast Miscellany Tolerating Jazz Correspondence " Strays " from the Laboratory ,,.,,, 222 The " Myracycle " Colored Sockets and Bases The Use of Exponents New A. C. Tubes The Telephone Transmission Unit New Apparatus Received Judging Tone Quality Edgar H. Felix 224 Condenser, Coil, Antenna Measurements - Keith Henney 227 A Super'Sensitive Shielded Five-Tube Receiver Herbert J. Reich, M. S. 229 Constructing a Five'Tube Neutrodyne - - Howard E. Rhodes 232 As the Broadcaster Sees It - - Carl Dreher 235 The Future of Television Local Regulation of Broadcasting Another Broadcast Fatality Memoirs of a Radio Engineer. No. XIX Use of Tubes Having High Amplification - - A. V. Loughren 238 " Radio Broadcast's" Laboratory Information Sheets - - 242 No. 113 Output Circuits No. 117 Super-Heterodynes No. 114 The Transmission Unit No. 118 Audio Amplifiers No. 115 Wave Traps No. 119 Radio-Frequency Choke Coils No. 116 Static No. no A-Battery Chargers Manufacturers' Booklets Available - - 248 " Radio Broadcast's" Directory of Manufactured Receivers - 250 What Kit Shall I Buy? 254 A Key to Recent Radio Articles - E. G. ShaJ^hauser 255 AMONG OTHER THINGS. . . ~D ADIO, or at least, its basic principles, be it known, is grad- -*-^- ually influencing other fields, and one of the most interest- ing examples of this is told by James Millen in our leading ar- ticle this month which describes the ingenious weightmeter developed by Albert Allen of Boston. While the theory of operation of this remarkable device is not complicated, many seemingly insurmountable problems were encountered and conquered before the instrument was practical enough for the strict requirements of commercial use. A WORD about some of the authors in this issue may be of •^ ^- interest. Herbert G. Reich, whose shielded neutrodyne is described in these pages, is a member of the Department of Physics at Cornell University. A. V. Loughren, whose paper on vacuum tubes appears in this issue, is in the research labor- atories of the General Electric Company at Schenectady. r T~ > HE Directory of Manufactured Receivers which appears in •*• this number, beginning on page 250, should prove of wide interest. Tabulated data on receiving sets have appeared be- fore, of course, but the information has been sketchy while our Directory is as complete in detail as it is possible to make it. From this listing, it is possible to determine much about the cir- cuit of any receiver listed, how its volume is controlled, how many and what sort of tubes there are and how much current they take, what accessories are supplied and, important enough, the size of the cabinet. What is more, by using the Service Depart- ment coupon, more complete or additional information will be forwarded each inquirer with a minimum of trouble to him. The Directory will appear regularly and will be improved each month with additions and corrections. Naturally it has not been possible to include even nearly all the receivers on the market, but we believe that, with the monthly additions, the list will prove an adequate source of information to such as may find it necessary to refer to it. "\ \ TE SHALL soon publish a paper by B. F. Miessner, whose * " work with 2-amp. a.c. tubes has become so well known. There is wide interest in the characteristics and use of these tubes and Mr. Miessner has prepared a very interesting paper indeed. . . . The Laboratory has designed an inexpensive and extremely simple tube tester which for some time has been put to good use out here at Garden City. Complete construc- tional and operating information about this tester will appear soon. — WILLIS KINGSLEY WING. Doubleday. Page & Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL El. Eco FRONTIER STORIES WEST Doubleda v, Page & Co. BOOK SHOPS (Books of all Publishers) LORD & TAYLOR BOOK SHOP PENNSYLVANIA TERMINAL (2 Shops) NEW YORK: GRAND CENTRAL TERMINAL 38 WALL ST. and 520 LEXINGTON AVE. 848 MADISON AVE. and 166 WEST 32ND ST. ST. Louis: 223 N. STH ST. and 4914 MARYLAND AVE. KANSAS CITY: 920 GRAND AVE. and 206 W. 47™ ST. CLEVELAND: HIGBEE Co. SPRINGFIELD, MASS.: MEEKINS. PACKARD& WHEAT Doubleday, Page & Co. OFFICES GARDEN CITY, N. Y. NEW YORK: 285 MADISON AVENUE BOSTON: PARK SQUARE BUILDING CHICAGO: PEOPLES GAS BUILDING SANTA BARBARA, CAL. LONDON: WM. HEINEMANN LTD. TORONTO: OXFORD UNIVERSITY PRESS Doubleday, Page & Co. OFFICERS F. N. DOUBLEDAY, President NELSON DOUBLEDAY, ^ice-President S. A. EVERITT, yice-Preiident RUSSELL DOUBLEDAY, Secretary JOHN J. HESSIAN, Treasurer L. A. COMSTOCK, Asst, Secretary L. J. McNAUGHTON, /Isst. Treasurer OOUBLEDAT, 'PAGE & COMPACT, Garden Qity, ^ Copyright, 1927, in the United States, Newfoundland, Great Britain, Canada, and other countries by Doubkday, Page &* Company. All rights reserved. TERMS: $4.00 a year; single copies 35 cents. .96