File:AmCyc Tunnel - top and bottom heading driven - ready for arching (front view).jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:35, 4 January 2013 | 935 × 791 (261 KB) | Bob Burkhardt | {{Information |Description={{en|Cross section of a tunnel, viewed head on, in the process of being built, in this case ready for the installation of an arch.}} |Source=''The American Cyclopædia'', v. 16, 1879, p. 33. |Date=1879 |Author=unknown artist;... |
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