File:PSM V17 D034 Edison microphone employing several carbon discs.jpg

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PSM_V17_D034_Edison_microphone_employing_several_carbon_discs.jpg (694 × 331 pixels, file size: 28 KB, MIME type: image/jpeg)

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Description Edison microphone employing several carbon discs
Date
Source Popular Science Monthly Volume 17
Author Unknown authorUnknown author
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current03:51, 16 August 2010Thumbnail for version as of 03:51, 16 August 2010694 × 331 (28 KB)Ineuw (talk | contribs){{Information |Description = Edison microphone employing several carbon discs |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_17.djvu/34 |Date = 1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Cat

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