File:PSM V17 D023 Microphone and speaker by elisha gray 1874.jpg
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DescriptionPSM V17 D023 Microphone and speaker by elisha gray 1874.jpg | Microphone and speaker by Elisha Gray 1874 | |||||
Date | ||||||
Source | Popular Science Monthly Volume 17 | |||||
Author | Unknown authorUnknown author | |||||
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current | 03:53, 20 February 2014 | 1,609 × 723 (59 KB) | Ineuw (talk | contribs) | Improved image contrast | |
01:37, 28 September 2013 | 1,636 × 757 (50 KB) | Ineuw (talk | contribs) | {{Information |Description = Microphone and speaker by Elisha Gray 1874 |Source = [http://www.archive.org/details/popularsciencemo17newy Popular Science Monthly Volume 17] |Date = 1880 |Author = {{unknown|Author}} |Permission = {{PD-old}} |other_... | ||
03:43, 16 August 2010 | 1,624 × 739 (61 KB) | Ineuw (talk | contribs) | {{Information |Description = Microphone and speaker by Elisha Gray 1874 |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_17.djvu/23 |Date = 1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category: |
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