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Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress (1901)

Boyd, James Penny, 1836-1910 · Philadelphia, A. J. Holman & co · leaf 613

An illustration from Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress, 1901, leaf 613
have been hoisted in less than twelve hours, from a depth of 1250 feet.To handle these enormous quantities tremendous hoisting engines areused. At the Calumet and Hecla mines is a pair of quadruple expansionengines which will lift cages, carrying six tons of ore. a mile in a minute anda half. The… … INGERSOLIi-SERGEANT STEAM-DRIVEN AIR COMPRESSOR. This machine weighs four hundred tons, and has seven separate subordinateengines for use in operating it. Think of it! An engine so ponderous thatsmaller engines are necessary to apply the clutches that set the reels inmotion; other engines set the…

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