Radio Broadcast (May 1929-Apr 1930)

JUL JL" >JLU CI B 33846 RADIO BROADCAST WILLIS KINGSLEY WING .... Editor KEITH HENNEY . Director of the Laboratory HOWARD E. RHODES . . Technical Editor EDGAR H. FELIX . . . Contributing Editor VOL. XV. NO. 3 1 PUBLISHED FOR THE RADIO INDUSTRY Contents for July, 1929 Questions the Trade Show Answered ------ 132 Selling the Romance of Radio The March of Radio Commission's Personnel Completed Trends in Radio Merchandising Educational Possibilities of Radio Radio's Toughest Sales Problem • Howard W. Dickinson An Editorial Interpretation Local Dealer Associations International Program Exchange European Radio Population Grows 133 136 Harry P. Bridge, Jr. 138 What They Say ---- The Month's Best Letters 141 The Trade-in Problem Interference Hunters Analyzing the 1928 Radio Survey T. A. Phillips 142 Professionally Speaking ------ Keith Henney 144 Needed — A Simple Battery Set The New General-Purpose Tube Value of Fundamental Knowledge John S. Dunham 145 In the Radio Marketplace News of the Trade 148 Loud Speaker Response Measurements P. H. Tartak 152 Book Reviews - - - - - - 153-168 Strays from the Laboratory Technical Shorts 154 Data on Foreign-Made Pentodes Symbols Used in Technical Writing Engineering Behind a Crosley Set A Simple Iine-Up Oscillator " Radio Broadcast's " Set Data Sheets ------ 159 The Sonora Model A-36 The Freed-Eisemann Model NR-78 A.C. New Features in the Silver Radio McMurdo Silver Why A.F. Transformers Burn Out The Experimenter's Armchair Skip-Distance and Range Table Engineering Features of the tjx-245 The Majestic Model 180 The Colonial Model 31 A.C. Fluorescence in Radio Vacuum Tubes Kenneth W. Jarvis Glenn H. Browning Herbert M. Isaacson Robert S. Kruse L. C. Young F.H.Engel 155 158 161 164 165 166 167 "Radio Broadcast's" Home-Study Sheets ---- 169 No. 25. Buzzers in Radio Experi No. 26. Coupled Circuits j ments Design Details of the Fada Set E. A. Uehling 171 The Serviceman's Corner - - - - - 174 Radio Broadcast Laboratory Information Sheets Howard E. Rhodes 178 F. Am No. 288 Index No. 289 Index (continued) No. 290 Filter Circuit Data No. 291 Voltage Doubling cuits No. 292 Voltage Doubling cuits The Tube Business CirCir No. 293 Regenerative R. plifiers No. 294 Regenerative R. F. Amplifiers No. 295 Tube Testing Circuits 177 The contents of this magazine is indexed in The Readers* Guide to Periodical Literature, which is on file at all public libraries among other things The Trade Show is over. It is of no importance to discuss whether it was "biggest and best" but it was certainly the most business-like of any we have yet attended. The arrangements this year provided for exhibitions and demonstrations in three hotels and, although they are quite close together, we believe it was generally agreed that the arrangement was a mistake. It is hoped that next year a location and city can be chosen where it will be possible to have exhibitions and demonstrations under one roof. We noticed among the dealers present an air of seriousness, a business-like attitude that appeared to have been less apparent in previous years. It seemed to us that those of the selling profession who attended were more interested in the merits of the merchandise shown than in more superficial matters. Dealers appeared more interested in technical features of the various offerings than in discounts. The Show was excellently managed by Clayton Irwin, Jr. and responsibility for the smoothness of the whole affair can largely be laid at his door. As for trends — that word, we fear is almost becoming a bromide — there were many. These we have summarized on another page. It is without doubt, a screengrid year. The engineers have seized upon the a.c. screen-grid tube because of its great technical advantages; the merchandisers have seized on the tube as a fine wedge to developing a new public appeal. Consumers everywhere are asking, What is this screen-grid? What does it mean? Dealers must be prepared to answer these questions and in a compelling reply will lie many new set sales. Undoubted public interest has been aroused by the screen-grid tube and it is the dealer who bears the greatest burden of translation. If 1928 showed the rise of the console cabinet, the 1929 show brings the console to its zenith. Table models were literally snowed under. All in all, it looks like a big year for radio. Our August issue will contain the new special section devoted to the tube industry, a second article by our research department on the figures on the radio business, continuing the one in this issue, and a number of especially interesting analyses of business methods of successful dealers. In our engineering section will appear a technical description of the new Stromberg-Carlson set, J. M. Stinchfield of Cunningham writes on detection, and we will present a technical description of the Hazeltine Laboratories' system of uniform amplification. — Willis Kingsley Wing. TERMS: $4.00 a year; single copies 35 cents; All rights reserved. Copyright, 1929, in the United States. Newfoundland, Great Britain, Canada, andother countries by MAGAZINES Country Life DOUBLEDAY, DORAN & COMPANY, INC., Garden City, New York . Radio Broadcast . . Short Stories . Le Petit Journal El Eco West World's Work . . The American Home BOOK SHOPS (Booh of all Publishers) . . . New York: <Lord & Taylor, James McCreery & Company, Pennsylvania Terminal, 166 West 32nd St., 848 Madison Ave., 51 East 44th Street, 420, 526, and 819 Lexington Avenue, Grand Central Terminal, 10 Wall Street> Atlantic! City: <2807 Bo\rdwalk> Chicago: <75 East Adams Street> St. Louis: <223 N. 8th St. and 4914 Maryland Ave.> Cleveland: <Higbee Company> Springfield, Mass: <Meekins, Packard & Wheat. OFFICES . . . Garden City, N. Y. New York: 244 Madison Avenue. Boston: Park Square Building. Chicago: Peoples Gas Building. Santa Barbara. Cal. London: Wm. Heinemann, Ltd. Toronto: Doubleday, Doban & Gundy, Ltd. OFFICERS . . . F. N. Doubleday, Chairman of the Board; Nelson Doubleday, President; S. A. Everitt. Vice-President; George II. Doban, Vice-President; Russell Doubleday, Secretary; John J. Hessian, Treasurer; Lillian A. Comstock, Asst't Secretary; L. J. McNaughton, Asst't Treasurer 130 •