File:PSM V07 D711 Light measuring apparatus.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:28, 4 July 2010 | 1,502 × 824 (54 KB) | Ineuw | {{Information |Description = Light measuring apparatus |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_7.djvu/711 |Date = 1875 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} {{GFDL-user-w|en|Wikisource|I |
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