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Scientific American, Vol. 59, No. 26 (1888) (1888)
leaf 3
which 2,400 feet is under the river, whichis here 42 feet deep. The = distance of the roof of the tunnel below the bed of the = T river averages about 25 feet. The material is blue a tenacious clay throughout, plastic and putty-like in consistency. About 150 men are nowat work. It does not appear… … immediately falls some distance below the mark on the scent, light plants supply illumination, © 1888 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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