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Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)

Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 383

An illustration from Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .., 1899, leaf 383
o drill them by hand. (2) The compressed air. after doing its work.is exhausted into the tunnel, and thus furnishes a continuous supply of freshair. The necessity for ventilation has often required the construction andoperation of expensive ventilating plants. Add to these improvements thelighting… … AMERICAN PORTAL. ST. CLAIR TUNNEL. NORTHOF DETROIT. MICH. becomes especially marked. Before the invention of explosives, hard rockwas sometimes broken by building wood tires next to the rock, and then,when the rock had become very hot, cooling it suddenly with water. Thesudden contraction would…

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