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| Keywords: IllinoisTunnelConstruction.jpg en Original captions Mines and Minerals Lateral Tunnel Under Construction Page's LATERAL CONDUIT UNDER CONSTRUCTION Western Lateral Conduit Under Construction and inscribed on the photo Illegible 9-15-02 Ill Telephone Telegraph Co -- Construction Methods -- This image is a composite from 3 published sources in order to eliminate artifacts from both printing and scanning For scale note that the track in the tunnel is 14-inch gauge George W Jackson Scope Extent and Construction of the Underground Conduits of the Illinois Telephone and Telegraph Co in Chicago http //books google com/books id DJ4PAQAAIAAJ pg PA485 Journal of the Western Society of Engineers Vol VII No 5 Oct 1902 ; page 485 George W Jackson Tunnel Construction in Chicago -- Method of Driving and Constructing So As Not To Disturb the Surface http //books google com/books id 5JrmAAAAMAAJ pg PA249 Mines and Minerals Vol XXIII No 6 Jan 1903 ; page 249 George W Jackson Underground Conduits in Chicago http //books google com/books id jz4AAAAAMAAJ pg PA321 Page's Magazine Vol II No 4 Apr 1903 ; page 321 George W Jackson died 1922 first published 1902-10 Created 1902-09-15 1902 in Chicago Chicago Tunnel Company Tunnel construction PD-old | ||||
