Electrophone
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Article
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1879
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Elsevier Science
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English
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Ader uses a sort of" drum, having on one side a diaphragm of parchment paper, about 15 cm. (5"91 in.) in diameter, ill the centre of which are circularly arranged six bits of tinned iron, 1 cm. ('374 in.) long, and 2 nim. ('079 in.) wide. upon these act six microscopic horse-shoe electro-magnet~, Wh