File:AmCyc Tunnel - arch built.jpg

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Original file ‎(933 × 787 pixels, file size: 262 KB, MIME type: image/jpeg)

Description
English: Cross section of a railroad tunnel, viewed head on, designed with an arch. The diagram is divided vertically in half. The left half shows the tunnel with the track installed; the right half with the arch facing installed.
Date
Source The American Cyclopædia, v. 16, 1879, p. 33.
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_-_arch_built.jpg

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8aa84f5f1b33f220c5283d36841337d2ae5adcba

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Date/TimeThumbnailDimensionsUserComment
current22:42, 4 January 2013Thumbnail for version as of 22:42, 4 January 2013933 × 787 (262 KB)Bob Burkhardt{{Information |Description={{en|Cross section of a railroad tunnel, viewed head on, designed with an arch. The diagram is divided vertically in half. The left half shows the tunnel with the track installed; the right half with the arch facing installe...

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