Odd Device Makes Music From Air (Aug, 1933)

Odd Device Makes Music From Air
A FRENCH engineer, Rene Bertrand, has developed an instrument which, he claims, will produce music through electrical transcription from the air. How the apparatus operates has not been divulged by the promoters, save for the information that it is far superior to the instrument devised by the Russian scientist, Prof. Theramin. Tone and volume of the music is controlled by the dials on the
two cabinets, while the sounds issue from the two large speakers.

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