File:Arnold (1913) pg 268 - Typical cross-sections of tunnel (Fig 68).jpg

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English: Figure 67 - Typical cross-section of Mission-Sunset Tunnel. For construction through earth, in two stages if desired. Total width of bore, 42 feet; 30 feet roadway. Figure 68 - Typical cross-section of combined traffic-transit tunnel. With provision for both surface and subway transit lines. Total width of bore, 60 feet; 24 ft. roadway. Corresponding to the design already submitted for the Broadway tunnel, except that the subway project is added.
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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_268_-_Typical_cross-sections_of_tunnel_(Fig_68).jpg

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current15:07, 27 July 2018Thumbnail for version as of 15:07, 27 July 20181,078 × 657 (103 KB)Mliu92 (talk | contribs)File:Arnold (1913) pg 268 - Typical cross-sections of tunnel.jpg cropped 18 % horizontally, 70 % vertically using CropTool with precise mode.

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