Radio Broadcast (May 1928-Apr 1929)

304 RADIO BROADCAST ADVERTISER Type 585 Amplifier Transformers The General Radio Company announces a new group of high quality transformers at a direct to the consumer price. This new group consists of two instruments, the type 585-D and the type 585-H, the amplification characteristics of which are shown below. Type 585-D Ratio 1:2 Pri. Inductance 79 H. Type 585-H Ratio 1:3.5 P" Inductance 71 H. Price, either type, #7.00 New Prices. Write for new catalog No. 930 listing new low prices on all General Radio parts on a direct from the factory basis. General Radio Co. 30 State Street, Cambridge, Massachusetts 274 Brannan Street, San Francisco, California A New Corbett Console for Radio and Phonograph A distinctive Corbett design enabling the custom set builder or dealer to offer an electrical instrument equal and in most cases superior to the highest priced Radiophonograph combinations on the market. The receiver compartment is a sliding tray 9x28x13^" deep. Special panel arrangement for any circuit or receiver will be cut out gratis, when specified, otherwise a 7/32" blank panel is included. Will take RCA Xo. 18 receiver. Model No. 150 Duo-Console Walnut or Mahogany S125.00 With electric motor driven turntable and pickup 200.00 Write for trade proposition and complete descriptive literature showing nine new models of radio cabinets, consoles, and combinations. CORBETT CABINET MFG. COMPANY St. Marys Pennsylvania Book Reviews (Continued from page 302) phrase, whereupon you are referred to " Flux, Leakage," and have to repeat the same procedure in the F's before you get what you are after. The book is intended to bridge the gap between the engineer and the "radio worker" — presumably someone who must utilize the knowledge of the engineer and must do it without the engineer's training and characteristic lingo. In the receiver field it accomplishes this feat as successfully as it can be done. Diagrams are used liberally. Although some of them are very elementary, their inclusion is justified, since the volume is intended to help people who need it precisely because their technical training is meagre. One diagram shows, in illustration of "Ampere-Turn" and "Ampere-Hour," an ammeter with the pointer indicating 1 on the scale, a clock with the sector between 1 and 2 shaded, and a coil connected in series with the ammeter with one turn and three turns to indicate one and three ampere-turns, respectively. In another place, radio tools, including scissors, round nose pliers, diagonal cutters, a panel hole cutter, and a counter-sink, are shown. While such radio tabloid stuff will not result in a tremendous demand for the book at M. I. T., it may help some of the lads struggling with definitions which seem obvious to a lot of people who once had to learn them just as painfully. Although the subject matter is not confined to radio receivers, everything is considered from the standpoint of a radio worker whose experience has been confined to reception. The treatment of television is sketchy and inferior to what can be learned from some of the newspaper supplements nowadays. There is nothing of practical value to the radio telephone transmitter specialist, and very little of anything in that line. Under "Microphone" there are five lines of formal definition, with no description of different types or modes of operation. Four lines are devoted to "Radio Telephony." But in this edition 56 newpages have been added on the screen-grid tube and the practice of socket power receiver operation. This is a typical placing of emphasis in this volume. The treatment is non-mathematical, as would be expected, and where algebraic formulas are used symbols are avoided, the words being written out. In its class "Drake's Radio Cyclopedia" is a worthy job, except for the title. Either a fewhundred pages on radio transmitter technique should be included in the next edition, or it should be called " Drake's Radio Receiving Encyclopedia." Bible Dramas. By William Ford Manley. Fleming H. Re veil Company, 1928. THIS book presents in printed form the series of biblicaldramasbroadcast on Sunday nights through the N. B. C. system. The stories of James of Galilee, David and Goliath, Judith, and other notables of Scripture are told in the form of radio plays suitable for church and social gatherings. A few pages of "Production Suggestions" precede the actual stories. I was not particularly impressed by the literary form of those of the plays I heard on the air, but they read quite well and the style partakes somewhat of the majesty of the Biblical narratives which, whatever you may think of the content, are not bad epics. The book will naturally interest the older citizens in the villages more than the metropolitan flappers who are dutifully following the prediction of the Epistle of Jude, 18^ "In the last time there shall be mockers, walking after their own ungodly lusts," but even this is not certain, with the " King of Kings," at this writing, showing once more on Broadway. (Continued on' page 306)