Radio broadcast .. (1922-30)

RADIO BROADCAST JANUARY, 1927 WILLIS K. WING, Editor KEITH HENNEY JOHN B. BRENNAN Director of the Laboratory Technical Editor EDGAR H. FELIX, Contributing Editor Vol. X, No. 3 Cover Design Frontispiece From a. Painting by Fred ]. Edgars ! Three Great Research Engineers 250 The Hundred-Billion-Dollar Vacuum Tube - James Stocky 251 The March of Radio - - - - - An Editorial Interpretation 255 Why the Department of Commerce Should Ways of Reducing Interference in the Ether Control Radio Who Can Tell What Is the "Best Radio Set?" Another Triumph for Short Waves—The Radio Leads to Another Technical Advance Beam System The Course of Patents in Dispute f The Marvels of the Coolidge Cathode Ray Who .Will Endow Broadcasting? Tube The Month in Radio Additional "Talking Movies" Interesting T hings Said Interestingly A Six-Tube Super-Heterodyne - Kendall dough 260 Piezoelectric Crystals - M. Thornton Dow 263 The New Inverse Duplex System David Grimes 266 The Listeners' Point of View - John Wallace 269 Radio Speakers Should Be Forbidden to Read The Banquet Broadcast Nuisance from Manuscript The Log of a Listener What Does the Listener Like in Radio Pro- Communications grams? Broadcast Miscellany The "Hi-Q" Receiver Leslie G. Biles 274 As the Broadcaster Sees It - - - Carl Dreher 277 Why Censorship of Programs Is Unfortunate The Lightning Jerker Deterioration of a Word Abstract of Technical Article Concerning B. C. Operators Latest ScientiBc Marvel of the AP Technical Notes of Interest to Broadcasters Technique of Field Operation Radio and Swinging Fists Memoirs of a Radio Engineer New Equipment - . . , 2 8 2 A Combined Amplifier and A. C. Operated Power-Supply Unit James Millen 284 How to Construct a Two-Tube Shielded "Lab" Receiver John B. Brennan 289 Letters From Readers - - - 206 RADIO BROADCAST'S Laboratory Information Sheets - - - 298 No. 57 What Is Resonance? No. 61 The Intermediate-Frequency Am- No. 58 The UX-i7i and UX-no plifier No. 59 What Are Harmonica? No. 61 Antenna Power Dissipation No. 60 Filter Circuit Data No. 63 Line Power-Supply Devices No. 64 The Gang Condenser "Now, I Have Found" - - 304 A Key to Recent Radio Articles - - E. G. Shal^hauser 310 The RADIO BROADCAST Technical Information Service - - 318 How the Radio Trade-Mark Is Protected - - Leo T. Parser 320 Manufacturers' Booklets Available - 322 Book Reviews --- 324 Practical Physics, Black and Divis. Reviewed by Edgar Fe\\x The American Announcer and Radio Log BEHIND EDITORIAL SCENES ALTHOUGH this January, 1927, RADIO BROADCAST is not decked out with red holly and demure Santa Clauses in appropriate poses, it is nevertheless a Christmas issue, and contains a greater quantity than usual of interesting material. In this issue, we have a description of a very interesting super- heterodyne which a large number of readers have been pleading for, ever since Kendall dough's article on super-heterodyne operation appeared in our September number. We present Thornton Dow's first article on the crystal and its use in radio, the first of a series of articles by David Grimes, describing his remarkable new inverse duplex circuit, a description of the new Hammarlund-Roberts "Hi-Q" receiver, and last, the two-tube R. B. "Lab." circuit receiver with the National Amplifier and B Supply. That is an array of technical and constructional material of which we are quite proud. For our Christmas presentation to our readers, we have omitted the seasonal decor- ations and have supplied as many fine technical articles as we could. Even so, the article by Howard Rhodes, of the RADIO BROADCAST Laboratory, telling of J. H. Hallberg's work on very short waves had to be held over for our February number. FOR those who have been wondering about the details of the cathode ray tube developed by Doctor Coolidge of the General Electric Company, James Stokley's leading article supplies the information and, what is more, not a little of the impression created by actually seeing the tube in operation. The tube is now more than a laboratory fact and the medical application lies with that profession. That step, we under- stand, has already been taken. . . . There is a paragraph on page 258 in the "March of Radio" directly under the heading "The Month in Radio," which is more than usually prophetic, as announcements about the time this magazine appears will well show. WE, like the aural Mr. Wallace, who each month interprets "The Listeners' Point of View," have a strong aversion to the average questionnaire. But so much nonsense has been uttered, and worse, written, about what the radio listener likes, that we have decided to give those listeners who read this magazine an opportunity to tell something of their habits and preferences. We hope that every reader will tear out page 270 and fill out the answers. THE tabulation of advertising volume in general and class magazines in Printers' In\ shows that for November maga- zines, RADIO BROADCAST had a total of 29,504 lines, being ex- ceeded by Radio J^ews with 35,506, and followed by Popular Radio with 29,315, Radio with 19,706, and Radio Age with 8834. RADIO BROADCAST for February will contain another article on the R. B. "Lab." Circuit, this time with especial reference to the four-tube model. We are beginning to hear from the provinces on this set and as Mr. Harvey Merwin of Florida phrased it, "the circuit is so much better than you said it was that I cannot understand why you did not shout louder, but perhaps it is wiser to let the user discover that for himself." The first of two articles by B. F. Miessner on electrically operated receivers will appear in February. Keith Henney is working on another of his popular tube articles which will soon appear. — WILLIS K. WING. Doubleday, Page tr Co. MAGAZINES COUNTRY LIFE WORLD'S WORK GARDEN & HOME BUILDER RADIO BROADCAST SHORT STORIES EDUCATIONAL REVIEW LE PETIT JOURNAL F.L Eco FRONTIER STORIES WEST Doubleday, Page 5* Co. BOOK SHOPS (Bookstall Publislers) LORD & TAYLOR PENNSYLVANIA TERMINAL (2 Shops) NEW YORK GRAND CENTRAL TERMINAL 38 WALL ST. and 526 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. 4/TH ST. CLEVELAND: HIGBEE Co. SPRINGFIELD, MASS.: MEEKINS, PACKARD & WHEAT Doubleday, Page & Co OFFICES GARDEN CITY, N. Y. NEW YORK: 285 MADISON AVE. BOSTON: PARK SQUARE BUILDING CHICAGO: PEOPLES GAS BUILDING SANTA BARBARA, CAL. LONDON: WM. HEINEMANN LTD. TORONTO: OXFORD UNIVERSITY PRESS Doubleday, Page ir ( o. OFFICERS F. N. DOUBLEDAY, President A. \V. PAGE, ^ice-President NELSON DOUBLEDAY, ^ice-President RUSSELL DOUBLEDAY, Secretary S. A. EVERITT, Treasurer JOHN J. HESSIAN, Asst. Treasurer DOLJBLEDAT, PAGE & COMPACT, Garden Qity, H.ew Tor\ Copyright, 1926, m the United States, ^wfoundland, Great Britain, Canada, and other countries by Doubleday, Page & Company. All rights reserved. TERMS: $4.00 a y^ar; single copies 35 cents. 248