Radio broadcast .. (1922-30)

.RXDIO BROADCAST ADVERTISER. . . . the most Complete Comprehensive and . . Authoritative . . . RADIO HANDBOOK ever published! Practical Radio Telegraphy and Telephony By RUDOLPH L. DUNCAN Director Radio Institute of America and CHARLES E. DREW Instructor in Radio and in charge of Electrical Division. Radio Institute of America This book contains over 900 pages of practi- cal information for SHIP, SHORE, and BROADCAST OPERATORS, RADIO EN- GINEERS, and AMATEURS. It is an ideal "Wireless Operators' Handbook" and a com- plete text for students of Wireless Communi- cation. 26 chapters—a progressive record of the latest 1929 practice—make this Radio Handbook in- dispensable for the practical radio man. Prin- ciples, methods and equipment are described in language readily understood by both the expert and the novice, and illustrated pro- fusely with more than 460 clear and illuminat- ing diagrams and photographs. The authors are two of the foremost teachers of the subject in the country. The book is the product of the School Division of the Radio Corporation of America and therefore repre- sents the last word on the subject. Never before has such a wealth of practical and usable data been collected in book form for the use of the many thousands for whom Radio is the most fascinating subject in the world. Price $7.50 Send in this coupon at once . . . and ex- amine the book at our expense. J A WILEY BOOK ^ Free Examination Coupon John Wiley and Sons, Inc. 440 Fourth Ave., New York Gentlemen: Kindly send me on ten days' free examination, Duncan and Drews' "Radio Telegraphy and Tele- phony." I agree to remit the price ($7.50) of the book within ten days after its receipt or return it postpaid. Name Address Position or Reference .Subscriber. . . . Yes. . . .No.. . .R.B.6-29 IQUALITY ONGAN PRODUCTS | A New Tube -}- Transformer once more Establish a Brand, New Standard of Power Tone No. 994 for use with The new UX-245 Tube Remember when the UX-250 Tubes came out? What a tremendous leap Radio Made. From rasping, indecipherable noise to soft, human reality. Radio critics took a new lease on life; cynics who scoffed at radio became fans overnight; and a few set manufacturers, who were first to grasp the significance of the new Volume Tone standard, became leaders in their industry. Refinement now begins. UX-245 Tubes are perfected. In the Dongan laboratories engineers have worked, urged on by their own enthusiasm, to develop exactly the right Power Amplifier Trans- former, as a necessary companion piece to the new Tube. No. 994 Transformer is the answer. It synchronizes with the Tube—with resulting Power and purity of Tone that delight the most demand- ing. The Finest Type of Power Amplifier with UX-245 Tubes use No. 994—Power Amplifier Transformer $12.00 No. 2189—Push Pull Output Transformer 12.00 No. 3107—Straight Output Transformer 12.00 D-946 —Standard Condenser Unit 22.50 No. 5554—Double Choke, use in Filter Circuit 11.00 These Dongan Parts are available now. Equip your receiver with this new amplifier —and enjoy still another of Radio's greatest advancements. Send check or money order. Further detail* on request DONGAN ELECTRIC MANUFACTURING CO. 2991-3001 Franklin Street Detroit .TRANSFORMERS of MERIT for FIFTEEN YEARS This is a good time to subscribe for RADIO BROADCAST Through your dealer or direct, by the year only $4.00 DOUBLEDAY, DORAN & CO., Inc. GARDEN CITY, N. Y. ofPrevew AMPFRITE automatically prevent "A" current fluctuations, lengthens tube life, improves set operation. Entirely unlike fixed resistors. A type for every tube—battery or A.C. FREE Ne Bluf Book" fftfc* latemt construction data, Write Dept,RB-e Wire Your Home for Radio For every radio need, in brushed brass or Baltelite. Fit standard electrical switch or outlet box. Single plates and in gang in many combinations No. 135—For Loud Speaker $1.00 No. 136—For Aerial and Ground. . . 1.00 No. 137—For Battery Connections. . 230 No. 138—For A C Connections 1.00 (Bakelite* 2$c additional per plate) YAXLEY MFG. CO. Dept. B. - i So. Clinton St., Chicago, III. 1920 pnpe 119