File:PSM V20 D319 Regulator of the paris observatory pendulum contact plates.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:01, 22 August 2010 | 1,146 × 995 (93 KB) | Ineuw | {{Information |Description = Regulator of the Paris Observatory pendulum contact plates |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_20.djvu/319 |Date = 1881-1882 |Author = Unknown |Permission = {{PD-old}} |other_versi |
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