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EADIO BROADCAST ADVERTISER Sheet Copper for Shielding Shielding Prevents aerial radia- tion and feedback. Insulates against in- terference from adjoin- ing circuits. Improves efficiency, selectivity and tone quality. USE SHEET COPPER because it combines low resistance with easy work- ing qualities. COPPER & BRASS RESEARCH ASSOCIATION 25 Broadway — New York hi January — '.'• «rking On Ultra-Short Waves. Details of Fascinating High- : rcquency Transmission by Voice—with circuit details. RADIO BROADCAST for January, on sale Dec. 15 • i IVE TUBE RADIO AGENTS WANTED BIG COMMISSION Demonstratingagent wanted; every county. Ex- clusive to right man. Sell what public wants — J .\ve tube, long distance, loud speaker radio with I tingle dial control. Price within reach of all. ! ;• 25,00 retail;liberal discount to agents. Sell in - Dare time—evenings. Noselling or radio experi- ice necessary- Territory going fast. 100 page ; adio BookFREE. Write today—don't delay. P. FISCHER.122 W. AustinAve.,Chicago ; AMPLION DRAGON AR19 $42.50 The most comprehen- sive line of radio re- producers in the world AMPLION CONE ACtt $10 AMPLION PATRiClAN AA18....,.$4S Amplion reproduces the entire musical scale with absolute fidelity — no matter what set you have, you need an Amplion to bring out its best THE Amplion Patrician assembles a 48" air- column with the matchless Amplion repro- ducing unit in a richly carved mahogany cabinet, I8"xl2"x9". The Patrician is non- directional and is notable for the pleasant, soft mellowness of its tone. The Amplion Cone is totally different in principle from any cone type of reproducer. Its especial superiority lies in its clear, clean-cut reproduction of speech. The Amplion Dragon is used as a standard of compari- son in radio experimental laboratories all over the world. To any radio enthusiast no gift could be more acceptable than an Amplion. Prices range from $12 to $45. Ask your dealer for a demonstration or write '^^ to us for interesting Amplion Booklet. ^^ THE AMPLION CORPORATION OF AMERICA Suite L, 280 Madison Avenue, New York City From 1887 A path of brilliant achievement ...... to 1927 9 AMPLION f *» Examined and approved by RADIO BROADCAST