Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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pagenum
="
335
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<
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number
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192
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<
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<
s
>A—TROUGH. B—ITS OPEN END. C—END THAT MAY BE CLOSED. D—STREAM.
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E—HOE. F—END-BOARD. G—BAG.
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with a small quantity of heavy sand, have settled in the trough, they wash
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in a bowl and collect in bags and carry away with them.</
s
>
</
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<
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type
="
main
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<
s
>Some people wash this kind of sand in a large bowl which can easily be
<
lb
/>
shaken, the bowl being suspended by two ropes from a beam in a building.
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lb
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</
s
>
<
s
>The sand is thrown into it, water is poured in, then the bowl is shaken, and
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lb
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the muddy water is poured out and clear water is again poured in, this being
<
lb
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done again and again. </
s
>
<
s
>In this way, the gold particles settle in the back part
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of the bowl because they are heavy, and the sand in the front part because it
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lb
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is light; the latter is thrown away, the former kept for smelting. </
s
>
<
s
>The one
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who does the washing then returns immediately to his task. </
s
>
<
s
>This method
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lb
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of washing is rarely used by miners, but frequently by coiners and goldsmiths
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lb
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when they wash gold, silver, or copper. </
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>
<
s
>The bowl they employ has only
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three handles, one of which they grasp in their hands when they shake the
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bowl, and in the other two is fastened a rope by which the bowl is hung from
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a beam, or from a cross-piece which is upheld by the forks of two upright
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lb
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posts fixed in the ground. </
s
>
<
s
>Miners frequently wash ore in a small bowl to test </
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
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archimedes
>