![File:Plate from Nicholson-II.png](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Plate_from_Nicholson-II.png/449px-Plate_from_Nicholson-II.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:51, 31 August 2009 | ![]() | 490 × 654 (58 KB) | MegaPedant | {{Information |Description={{en|1=A plate from Peter Nicholson's book ''The Guide to Railway Masonry, containing a Complete Treatise on the Oblique Arch'' showing the development of the intrados of a helicoidal skew arch against its plan view}} |Source=Pl |
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