Agricola, Georgius
,
De re metallica
,
1912/1950
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>A—LAUNDER. B—INTERLACING FIR TWIGS. C—LOGS; THREE ON ONE SIDE, FOR THE
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FOURTH CANNOT BE SEEN BECAUSE THE DITCH IS SO FULL WITH MATERIAL NOW BEING
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WASHED. D—LOGS AT THE HEAD OF THE DITCH. E—BARROW. F—SEVEN-PRONGED
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FORK. G—HOE</
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>The third method of washing materials of this kind follows. </
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>Two
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strakes are made, each of which is twelve feet long and a foot and a
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half wide and deep. </
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>A tank is set at their head, into which the water flows
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through a little launder. </
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>A boy throws the ore into one strake; if it is of
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poor quality he puts in a large amount of it, if it is rich he puts in less. </
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>The
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water is let in by removing the plug, the ore is stirred with a wooden shovel,
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and in this way the tin-stone, mixed with the heavier material, settles
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in the bottom of the strake, and the water carries the light material into the
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launder, through which it flows on to a canvas strake. </
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>The very fine tin
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stone, carried by the water, settles on to the canvas and is cleansed. </
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>A low
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cross-board is placed in the strake near the head, in order that the largest
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sized tin-stone may settle there. </
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>As soon as the strake is filled with the
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material which has been washed, he closes the mouth of the tank and continues
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washing in the other strake, and then the plug is withdrawn and the
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water and tin-stone flow down into a tank below. </
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<
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>Then he pounds the sides </
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