![File:Macewen's Triangle demonstration.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Macewen%27s_Triangle_demonstration.jpg/766px-Macewen%27s_Triangle_demonstration.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:39, 23 July 2012 | ![]() | 1,457 × 1,140 (222 KB) | Materialscientist | {{Information |Description ={{en|1=William Macewen (1848-1924) demonstrating his triangle to a group which includes Lane, Hirschfelder, Barkan, Stillman. }} |Source =http://ihm.nlm.nih.gov/images/B17743 |Author =Unknown |Date ... |
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