File:PSM V17 D027 Carbon microphone of Elisha Gray.jpg
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Size of this preview: 475 × 599 pixels. Other resolutions: 190 × 240 pixels | 380 × 480 pixels | 879 × 1,109 pixels.
Original file (879 × 1,109 pixels, file size: 179 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:03, 18 February 2014 | 879 × 1,109 (179 KB) | Ineuw | Improved image contrast | |
03:46, 16 August 2010 | 939 × 1,127 (165 KB) | Ineuw | {{Information |Description = Carbon microphone of Elisha Gray |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_17.djvu/27 |Date = 1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Popular Sc |
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