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Summary
| Description |
English: Original Caption: "Showing Conduits as Completed Sept 1. 1902." Retouched to remove spots and improve legibility. The short side spurs terminating in dots are the shafts used to construct the tunnel system. |
| Date | |
| Source | George W. Jackson, Scope, Extent and Construction of the Underground Conduits of the Illinois Telephone and Telegraph Co. in Chicago, Journal of the Western Society of Engineers, Vol. VII, No. 5 (Oct. 1902); page 495. |
| Author | George W. Jackson (died 1922) |
| Other versions |
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Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:47, 22 March 2010 | | 498 × 845 (64 KB) | Douglas W. Jones | {{Information |Description={{en|1=Original Caption: "Showing Conduits as Completed Sept 1. 1902." Retouched to remove spots and improve legibility. The short side spurs terminating in dots are the shafts used to construct the tunnel system.}} |Source=G |
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