File:PSM V20 D320 Pendulum of secondary clock.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:02, 22 August 2010 | 951 × 1,625 (237 KB) | Ineuw | {{Information |Description = Pendulum of secondary clock |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_20.djvu/320 |Date = 1881-1882 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Popular S |
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