Agricola, Georgius
,
De re metallica
,
1912/1950
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also separate the concentrates from the broken rock in them and collect them
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in tubs. </
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<
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>The short strake is now rarely employed by miners, owing to the
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carelessness of the boys, which has been frequently detected; for this
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reason, the jigging-sieve has taken its place. </
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<
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>The mud which settles in the
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launder, if the ore is rich, is taken up and washed in a jigging-sieve or on a
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canvas strake.</
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>A—SHORT STRAKE. B—SMALL LAUNDER. C—TRANSVERSE LAUNDER. D—WOODEN
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SCRUBBER.</
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<
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>A canvas strake is made in the following way. </
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>Two beams, eighteen feet
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long and half a foot broad and three palms thick, are placed on a slope; one
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half of each of these beams is partially cut away lengthwise, to allow the ends
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of planks to be fastened in them, for the bottom is covered by planks three
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feet long, set crosswise and laid close together. </
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<
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>One half of each supporting
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beam is left intact and rises a palm above the planks, in order that the water
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that is running down may not escape at the sides, but shall flow straight
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down. </
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<
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>The head of the strake is higher than the rest of the body, and slopes
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so as to enable the water to flow away. </
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<
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>The whole strake is covered by six
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stretched pieces of canvas, smoothed with a stick. </
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<
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>The first of them occupies
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the lowest division, and the second is so laid as to slightly overlap it; on </
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