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Scientific American, Vol. 74, No. 4 (January 1896) (1896)

leaf 7

An illustration from Scientific American, Vol. 74, No. 4 (January 1896), 1896, leaf 7
the tunnel was driven through the London The use of the antiquated jack screws was abandoned, clay for its whole length, no water had to be dealt the idea of operating the same for excavating the hydraulic power being substituted as a means for en- with and no difficulties were .encountered." small… … HYDRAULIC SHIELD TISED IN THE ST, CLAIR RIVER TTJNNEL. © 1896 SCIENTIFIC AMERICAN, INC.

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