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 .. . perated the pumps in the Cornish system, had conceivedthe idea of nailing steps on to them at intervals, and riding up and mines grew deeper and the time and labor required for the men to getdown to their work increased, a special engine, utilizing an improvement ofthis device, was employ
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 .. . perated the pumps in the Cornish system, had conceivedthe idea of nailing steps on to them at intervals, and riding up and mines grew deeper and the time and labor required for the men to getdown to their work increased, a special engine, utilizing an improvement ofthis device, was employed for raising and lowering men. This man-engine consisted of two parallel beams, moving slowly up and down the shaft witha reciprocating motion, the length of the stroke being about twelve these beams small platforms were nailed at distances equal to thelength of the stroke. The miner wishing to descend stepped upon the topplatform of one beam as it started on its down stroke. At the end of thisstroke he found himself twelve feet down the shaft, on a level with thesecond platform of the other beam, which had in the mean time been comingup, and he stepped across on to this, which now began its down stroke. Thusby constantly stepping from one rod to the other at the completion of each. INGERSOLL-SERGEANT DUPLEX STEAM-ACTUATED AIR COMPRESSOR. down stroke, he was conveyed to the bottom. By reversing the process hewas raised to the surface. In general, mining progress was slow up to the middle of the production of the baser metals, here and abroad, increased graduallywith the demands of the mechanic arts, but it was not until the middle ofthe century that this factor, joined with the improved methods of transporta-tion, and of metallurgy, gave to mining that impetus which, though throughalternate recurring waves of prosperity and stagnation, carried it forwarduntil the annual expenditure for technical skill, machinery, and supplies usedin the industry is estim
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Keywords: ., bookcentury1800, bookdecade1890, bookidtri, booksubjectinventions
