Agricola, Georgius
,
De re metallica
,
1912/1950
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which they unload separately and crush and wash. </
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>When they draw up
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buckets of water they empty the water through the hopper into a trough,
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through which it flows away.</
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>A—TIMBER PLACED IN FRONT OF THE SHAFT. B—TIMBER PLACED AT THE BACK OF THE
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SHAFT. C—POINTED STAKES. D—CROSS-TIMBERS. E—POSTS OR THICK PLANKS.
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F—IRON SOCKETS. G—BARREL. H—ENDS OF BARREL. I—PIECES OF WOOD.
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K—HANDLE. L—DRAWING-ROPE. M—ITS HOOK. N—BUCKET. O—BALE OF THE
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BUCKET.</
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>The next kind of machine, which miners employ when the shaft is
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deeper, differs from the first in that it possesses a wheel as well as cranks.
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>This windlass, if the load is not being drawn up from a great depth, is turned
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by one windlass man, the wheel taking the place of the other man. </
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>But if the
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depth is greater, then the windlass is turned by three men, the wheel being
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substituted for a fourth, because the barrel having been once set in motion,
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the rapid revolutions of the wheel help, and it can be turned more easily.
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>Sometimes masses of lead are hung on to this wheel, or are fastened to the
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spokes, in order that when it is turned they depress the spokes by their weight
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and increase the motion; some persons for the same reason fasten into the
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barrel two, three, or four iron rods, and weight their ends with lumps of lead.
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<
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>The windlass wheel differs from the wheel of a carriage and from the one </
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