Making recording on Emile Berliner's Gramophone (1887). Speaking into tube produced trace on glass disc (A) coated with lamp-black. D, electric motor, E its battery. Trace fixed by varnishing, then copied in metal photographically. From Cassell's Family Magazine, London, 1888 Engraving

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TOP09100408

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達志影像

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RM

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須由TPG 完整授權

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