Amateur talking pictures and recording (1933)

Record Details:

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( •' >\CLUSION 209 Fig. 90a. Mills Sound System Gramophone Atta< bment impulses are delivered to a special type of magnetic coil which operates on either direct or alternating current This is thrown to action by the impulses, and picture chance is effected, not as might be expected, by the electro-magnet, butbyasprmg. In other words, the electrical impulse gives