Agricola, Georgius
,
De re metallica
,
1912/1950
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it on each edge narrow strips, of no great thickness, and fix them to the beams
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with nails. </
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<
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>They agitate the metalliferous material with wooden scrubbers
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and wash it in a similar way. </
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<
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>As soon as little or no mud remains on the
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canvas, but only concentrates or fine tin-stone, they lift one beam so that
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the whole strake rests on the other, and dash it with water, which has been
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drawn with buckets out of the small tank, and in this way all the sediment
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which clings to the canvas falls into the trough placed underneath. </
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<
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>This
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trough is hewn out of a tree and placed in a ditch dug in the ground; the
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interior of the trough is a foot wide at the top, but narrower in the bottom,
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because it is rounded out. </
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<
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>In the middle of this trough they put a cross
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board, in order that the fairly large particles of concentrates or fairly large
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sized tin-stone may remain in the forepart into which they have fallen, and
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the fine concentrates or fine tin-stone in the lower part, for the water flows
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from one into the other, and at last flows down through an opening into the
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pit. </
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<
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>As for the fairly large-sized concentrates or tin-stone which have been
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removed from the trough, they are washed again on the ordinary strake. </
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>A—CANVAS STRAKE. B—MAN DASHING WATER ON THE CANVAS. C—BUCKET.
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D—BUCKET OF ANOTHER KIND. E—MAN REMOVING CONCENTRATES OR TIN-STONE
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FROM THE TROUGH.</
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