File:Arnold (1913) pg 267 - Typical cross-section of Mission-Sunset Tunnel (cropped).jpg

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Description
English: Figure 66 - Typical cross-section of Mission-Sunset Tunnel. Designed for construction in rock. Total width of bore, 42 feet. This may be erected in two stages if desired. Traffic tunnel, first stage; subway, second stage.
Date
Source Arnold, Bion J. (March 1913) "11. Market Street extension tunnel under Twin Peaks" in Report on the Improvement and Development of the Transportation Facilities of San Francisco, pp. 225–270 Retrieved on 17 April 2018.
Author Uncredited illustrator(s), drafter(s), and photographer(s). First published by and generally credited to Bion Arnold
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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.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Arnold_(1913)_pg_267_-_Typical_cross-section_of_Mission-Sunset_Tunnel_(cropped).jpg

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current15:05, 27 July 2018Thumbnail for version as of 15:05, 27 July 2018866 × 629 (91 KB)Mliu92 (talk | contribs)File:Arnold (1913) pg 267 - Typical cross-section of Mission-Sunset Tunnel.jpg cropped 35 % horizontally, 71 % vertically using CropTool with precise mode.

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