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Radio Record, Volume II, Issue 11, 28 September 1928, Page 32

A DEVICE bas been invented by which aeroplane pilots can be dir ected from a base without the use 0 headphones and a trailing aer ial. The headset is replaced by a visual indicat tor which shows when a plane is ov or off its course marked by a directive aerial beacon. A short vertical rod displaces the dangling wire which frequently lashes itself to pieces and is a constant seurce of trouble to the pilot. The receiver weighing only 15lbs. is designed to be tuned from 285 to 350 kilocyeles and may be used for the, reeeption of tadio telephone and telegrapb messages. beiug arranged for remote control of tuning and volume. . It is doubly shielded. and shielding of the engine ignition system is also employed.