Agricola, Georgius
,
De re metallica
,
1912/1950
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181 - 210
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271 - 300
301 - 312
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315
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<
s
>This method of washing has lately undergone a considerable change; for
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lb
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the launder which carries the water, mixed with the crushed tin-stone and
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fine sand which flow from the openings of the screen, does not reach to a
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transverse trough which is inside the same room, but runs straight through
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a partition into a small settling-pit. </
s
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<
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>A boy draws a three-toothed rake
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through the material which has settled in the portion of the launder outside
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the room, by which means the larger sized particles of tin-stone settle at the
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bottom, and these the washer takes out with the wooden shovel and carries
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into the room; this material is thrown into an ordinary strake and swept
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with a wooden scrubber and washed. </
s
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<
s
>As for those tin-stone particles which
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lb
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the water carries off from the strake, after they have been brought back on to
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lb
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the strake, he washes them again until they are clean.</
s
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</
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main
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<
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>The remaining tin-stone, mixed with sand, flows into the small settling-pit
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lb
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which is within the building, and this discharges into two large buddles. </
s
>
<
s
>The
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lb
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tin-stone of moderate size, mixed with those of fairly large size, settle in the
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lb
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upper part, and the small size in the lower part; but both are impure, and
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lb
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for this reason they are taken out separately and the former is washed twice, </
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<
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175
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>A—FIRST LAUNDER. B—THREE-TOOTHED RAKE. C—SMALL SETTLING PIT. D—LARGE
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BUDDLE. E—BUDDLE RESEMBLING THE SIMPLE BUDDLE. F—SMALL ROLLER. </
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<
s
>G—
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BOARDS. H—THEIR HOLES. I—SHOVEL. K—BUILDING. L—STOVE. (THIS PICTURE
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DOES NOT ENTIRELY AGREE WITH THE TEXT).</
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</
text
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