Radio Broadcast (May 1928-Apr 1929)

RADIO BROADCAST ADVERTISER 311 Here's the Answer to every question about the principles, methods, or apparatus of radio transmitting and receiving. THE RADIO MANUAL A Complete Course in Radio Operation In a Single Volume A Handbook for Students Amateurs Operators Inspectors For the first time an entire course of training in one book — the most complete and up-to-date work on '4f ■ By radio. Developed ,jBp^^^ simply and clearly F W^r^ from the elementary stage right through all phases of principles, practise, and apparatus so that a beginner with no knowledge of electricity may [get all he needs either for amateur operation or to qualify for a government license as operator or inspecter. Prepared by Official Examining Officer The author. G. E. Sterling, is Radio Inspector and Examining Officer, Radio Division, U. S. Dept. of Commerce. The book has been edited in detail by Robert S. Kruse for five years Technical Editor of QST., the Magazine of the Radio Relay League. Many other experts assisted them. H Chapters Cover: ^nSt tors and Generators; Storage Batteries and Charging Circuits; The Vacuum Tube; Circuits Employed in Vacuum Tube Transmitters; Modulating Systems; Wavemeters; Piezo-Electric Oscillators; Wave Traps; Marine Vacuum Tube Transmitters; Radio Broadcasting Equipment; Arc Transmitters; Spark Transmitters; Commercial Radio Receivers; Radio Beacons and Direction Finders; Radio Laws and Regulations; Handling and Abstracting Traffic. Npill Infnrmntinn never before available such i\eil/ inwrmUUOn as a compiete description of the Western Electric 5 Kilowatt Broadcasting Transmitter; description and circuit diagram of Western Electric Superheterodyne Radio Receiving Outfit type 6004-C; Navy Standard 2-Kilowatt Spark Transmitter; etc.; etc. Every detail up to the minute. Free Examination "The Radio Manual" is now on the press and will be ready shortly. Over poo pages. Profusely illustrated. Bound in Flexible Fabrikoid. Regular price after publication will be S6.00. Orders received now will be accepted at the special advance price of $4.95 — an amazingly low price for the best Radio book available. Send for free examination. Pay or return in ten days. Order on This Coupon D. Van Nostrand Co., Inc., 8 Warren St., New York Send me as soon as published THE RADIO MANUAL for examination. Within ten days after receipt I will either return the volume or send you $4.Q5^the special advance price. (Radio Broadcast 9-2 Name St. &No .. City and State HAMMARLUND'S New "Battleship" MULTIPLE CONDENSER Licensed under Hogan Single' Control Patent No. 2,014,002 and Lowenstein Patent No. 1,258,423 B TWO THREE and FOURGANG MODELS A Good Circuit Deserves it! RUTE strength and beauty of design characterize the new Hammarlund "Battleship" Multiple Condenser — leader of the gangs. Warpless, die-cast frame; plates permanently aligned; free-moving rotor. Terminals mounted on Bakelite strip beneath the frame. The sections of this condenser are matched to within one-fourth of one percent (plus or minus) — the closest precision obtainable. Recesses in the frame permit the direct attachment of Hammarlund Equalizing Condensers for exactly balancing each unit. The shaft is for strength, turned down to lA" at dial end. Obtainable in two capacities (350 mmfd. and 500 mmfd.) — dual, triple and quadruple models. If your dealer can V supply you, write direct to us. Ask for Hammarlund literature. HAMMARLUND MFG. CO. 424-438 W. 33rd St. New York, N. Y. ammarlund PRECISION PRODUCTS 4TH EDITION Just Off Press RADIO THEORY and OPERATING" by Mary Texanna Loomis The standard radio text and reference book of America. Nearly 900 pages, over 700 illustrations, flexible binding. PRICE $3.50— Postage Paid For sale by hundreds of bookdealers throughout America and many foreign countries. Or may be purchased direct from the publishers. Send check or money order to LOOMIS PUBLISHING COMPANY Dept. 10 Washington, D. C. Fahnestock Clips RADIO'S GREATEST CONVENIENCE Used by Manufacturers of Standard Sets and Parts — and by Manufacturers of High Grade Wet and. Dry Batteries. ALL GENUINE FAHNESTOCK CLIPS bear our imprint on the thumb piece of the clip. WORLD'S LARGEST MAKER OF CLIP TERMINALS 48 different sizes and styles to meet all requirements. Send for Catalog and Samples FAHNESTOCK ELECTRIC CO. L I City Nevr York