Agricola, Georgius
,
De re metallica
,
1912/1950
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<
pb
pagenum
="
333
"/>
<
p
type
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main
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<
s
>Some people construct a frame not unlike the one covered with canvas,
<
lb
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but shorter. </
s
>
<
s
>In place of the canvas they set pieces of turf in rows. </
s
>
<
s
>They </
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</
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<
figure
number
="
190
"/>
<
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type
="
caption
">
<
s
>A—HEAD OF FRAME. B—SMALL LAUNDER THROUGH WHICH WATER FLOWS INTO HEAD OF
<
lb
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FRAME. C—PIECES OF TURF. D—TROUGH PLACED UNDER FRAME. E—TUB IN WHICH
<
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PIECES OF TURF ARE WASHED.
<
lb
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wash the sand, which has been thrown into the head of the frame, by letting
<
lb
/>
in water. </
s
>
<
s
>In this way the particles of gold settle in the turf, the mud and
<
lb
/>
sand, together with the water, are carried down into the settling-pit or trough
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below, which is opened when the work is finished. </
s
>
<
s
>After all the water has
<
lb
/>
passed out of the settling-pit, the sand and mud are carried away and washed
<
lb
/>
over again in the same manner. </
s
>
<
s
>The particles which have clung to the turf
<
lb
/>
are afterward washed down into the settling-pit or trough by a stronger
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lb
/>
current of the water, which is let into the frame through a small launder.
<
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/>
</
s
>
<
s
>The concentrates are finally collected and washed in a bowl. </
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>
<
s
>Pliny was not
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lb
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ignorant of this method of washing gold. </
s
>
<
s
>“The ulex,” he says, “after being
<
lb
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dried, is burnt, and its ashes are washed over a grassy turf, that the gold
<
lb
/>
may settle on it.”</
s
>
</
p
>
</
chap
>
</
body
>
</
text
>
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archimedes
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