Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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pagenum
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300
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<
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<
s
>Seven methods of washing are in common use for the ores of many
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metals; for they are washed either in a simple buddle, or in a divided buddle,
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or in an ordinary strake, or in a large tank, or in a short strake, or in a canvas
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strake, or in a jigging sieve. </
s
>
<
s
>Other methods of washing are either peculiar
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to some particular metal, or are combined with the method of crushing wet
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ore by stamps.</
s
>
</
p
>
<
p
type
="
main
">
<
s
>A simple buddle is made in the following way. </
s
>
<
s
>In the first place, the head
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is higher than the rest of the buddle, and is three feet long and a foot and a half
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broad; this head is made of planks laid upon a timber and fastened, and
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on both sides, side-boards are set up so as to hold the water, which flows in
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through a pipe or trough, so that it shall fall straight down. </
s
>
<
s
>The middle of
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the head is somewhat depressed in order that the broken rock and the larger
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metallic particles may settle into it. </
s
>
<
s
>The buddle is sunk into the earth to a
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depth of three-quarters of a foot below the head, and is twelve feet long and
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a foot and a half wide and deep; the bottom and each side are lined with
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planks to prevent the earth, when it is softened by the water, from falling
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in or from absorbing the metallic particles. </
s
>
<
s
>The lower end of the buddle is
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/>
obstructed by a board, which is not as high as the sides. </
s
>
<
s
>To this straight
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/>
buddle there is joined a second transverse buddle, six feet long and a foot
<
lb
/>
and a half wide and deep, similarly lined with planks; at the lower </
s
>
</
p
>
</
chap
>
</
body
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</
text
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