Arnold (1913) pg 259 - Typical sections of rapid transit tunnel (cropped).jpg
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Summary
| Description |
English: Figure 64 - Typical arch roof section of rapid transit tunnel. To be used under the hill, showing maximum outline and clearance lines for rapid transit rolling stock. Thickness of lining and shape of invert dependent upon the character of ground encountered. Clearance lines shown are required on tangents and curves of 800 feet radius or over.
Figure 65 - Typical flat roof section of rapid transit tunnel. Suited to Market STreet. Clearances shown are required on tangents and curves of 800 feet radius or over. |
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| 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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Licensing
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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, 1930.
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| current | 15:02, 27 July 2018 | | 1,073 × 889 (198 KB) | wikimediacommons>Mliu92 | File:Arnold (1913) pg 259 - Typical sections of rapid transit tunnel.jpg cropped 19 % horizontally, 59 % vertically using CropTool with precise mode. |
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