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Scientific American, Vol. 84, No. 25 (1901) (1901)
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tunnel is built on a downward incli- work. The cost of the tunnel is about nation (1:20), but becomes more level $425,000, or $850 per yard. as it passes under the river (1:600). —__-- 0 e—___—_— The tunnel tube is composed of cast- Turpentine mixed with wax is iron annular segments varying in… … Rear Face of Shield. A Bend in the Tunnel. © 1901 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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