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Radio Record, Volume I, Issue 11, 30 September 1927, Page 13

The speech-amplifiers generally ased to make addresses audible to a Targe gathering «re usually wired systems; but a new method was tried ont at the e¢emmeneement of the Georgia School of Technology, Atlanta, U.S.A. 9 The speeches of the day were acinallv broadeast by radio, through WGST, and reproduced by the toudsneakers_ of powerful receiving scts distributed among the audience. Some reeciving sets howl when the loudspeaker is turned towards them. A cure for this is to place a rubber cap, made oxt of an old bicevele tube, | over cach valve.