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File:AmCyc Tunnel - Musconetcong cross section - no support.jpg

AmCyc_Tunnel_-_Musconetcong_cross_section_-_no_support.jpg ‎(546 × 436 pixels, file size: 64 KB, MIME type: image/jpeg)

Description
English: Line drawing of a schematic cross section of Musconetcong tunnel in segments where the walls and ceiling require no support.
Date
Source The American Cyclopædia, v. 16, 1879, p. 32.
Author unknown artist; article by Henry S. Drinker
Permission
(Reusing this file)
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_-_Musconetcong_cross_section_-_no_support.jpg

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current22:10, 4 January 2013Thumbnail for version as of 22:10, 4 January 2013546 × 436 (64 KB)Bob Burkhardt{{Information |Description={{en|Line drawing of a schematic cross section of Musconetcong tunnel in segments where the walls and ceiling require no support.}} |Source=''The American Cyclopædia'', v. 16, 1879, p. 32. |Date=1879 |Author=unknown artist; ...

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