File:AmCyc Tunnel - top and bottom heading driven - ready for arching (front view).jpg

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Description
English: Cross section of a tunnel, viewed head on, in the process of being built, in this case ready for the installation of an arch.
Date
Source The American Cyclopædia, v. 16, 1879, p. 33.
Author unknown artist; article by Henry S. Drinker
Permission
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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:AmCyc_Tunnel_-_top_and_bottom_heading_driven_-_ready_for_arching_(front_view).jpg

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current22:35, 4 January 2013Thumbnail for version as of 22:35, 4 January 2013935 × 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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