Unusual Loudspeakers
An American Invention ne ee ee PILLows, photographs, vases and wall hangings as loudspeakers are the latest thing in radio, developed by a Washington inventor, who has been experimenting to do away with old-style loudspeakers. These ingenious reproducers, which harmonise with other room furnishings and decorations, have been made possible by a new type of speaker unit. The individual unit, which may be made in many different forms, is. said to. operate on the condenser principle. In speakers of this type the vibration is caused hy the variations in attraction between two conducting bodiés when they are subjected to. consideralle differences in electrical potential. In the new design layers of conducting and non-conducting paper are subjected to the varying voltage that represents the music or speech at the output of the radio receiver. The .nonconducting paper is, of course, made of» ordinary pulp fibre, while the conducting sheets are rolled from pulp that has been Impregnated with metallic dust.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300110.2.47.6
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Radio Record, Volume III, Issue 26, 10 January 1930, Page 15
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161Unusual Loudspeakers Radio Record, Volume III, Issue 26, 10 January 1930, Page 15
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