Radio Broadcast (May 1929-Apr 1930)

.RADIO BROADCAST ADVERTISER. J5T . . . 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 practical information for SHIP, SHORE, and BROADCAST OPERATORS, RADIO ENGINEERS, and AMATEURS. It is an ideal "Wireless Operators' Handbook" and a complete text for students of Wireless Communication. 26 chapters — a progressive record of the latest 1929 practice — make this Radio Handbook indispensable for the practical radio man. Principles, methods and equipment are described in language readily understood by both the expert and the novice, and illustrated profusely with more than 460 clear and illuminating 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 represents 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 examine 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 Telephony." 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 r QUALITY PRODUCTS A New Tube + Transformer once more Establish a Brand, New Standard of Power No. 994 for use with The new UX-245 Tube Remember when the UX-250 Tubes Refinement now begins. UX-245 came out? What a • tremendous leap Tubes are perfected. In the Dongan Radio Made. laboratories engineers have worked, urged From rasping, indecipherable noise to on by their own enthusiasm, to develop soft, human reality. Radio critics took exactly the right Power Amplifier Transa new lease on life; cynics who scoffed former, as a necessary companion piece at radio became fans overnight; and a to the new Tube. No. 994 Transformer few set manufacturers, who were first to is the answer: It synchronizes with the grasp the significance of the new Volume Tube — with resulting Power and purity Tone standard, became leaders in their of Tone that delight the most demandindustry, 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 details 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. unceo/Prewn|i AMPERITE automatically prevents "A" current fluctuations, lengthens tube life, improves set operation. Entirely unlike fixed resistors. A type for every tube— battery or A.C. -^gefiaff Gotnpatty* ^O'TRANKLIN ST., NEW YORK FREE New "Amperite Blue Book" gives latest construction data. * Write Dept. RB-G She "SELF-ADJUSTING" Rheostat Wire Your Home for Radio For every radio need, in brushed brass or Balcelite. 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. . 2.50 No. 138— For A C Connections 1.00 (Bakelite, 25c additional per plate) YAXLEY MFG. CO. Dept. B. ■ 9 So. Clinton St., Chicago, III. • junc. 1929 pat-e 119 •