File:PSM V19 D203 Rotating perforated disc for modulating sound flow.jpg
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Original file (1,011 × 1,282 pixels, file size: 255 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:50, 21 August 2010 | 1,011 × 1,282 (255 KB) | Ineuw | {{Information |Description = Rotating perforated disc for modulating sound flow |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_19.djvu/203 |Date = 1881 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[ |
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