File:PSM V16 D025 Early vacuum tube experiments.jpg
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Size of this preview: 800 × 512 pixels. Other resolutions: 320 × 205 pixels | 640 × 409 pixels | 1,115 × 713 pixels.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:15, 14 August 2010 | 1,115 × 713 (127 KB) | Ineuw | {{Information |Description = Early vacuum tube experiments |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_16.djvu/25 |Date = 1879-1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Popular |
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