Agricola, Georgius
,
De re metallica
,
1912/1950
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teeth, and now again levelled down with a hoe, both of which are made of iron.
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>The very fine tin-stone requires to be burned less than that of moderate size,
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and this again less than that of the largest size. </
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>While the tin-stone is being
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thus burned, it frequently happens that some of the material runs together. </
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>A—FURNACE. B—ITS MOUTH. C—POKER. D—RAKE WITH TWO TEETH. E—HOE.
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The burned tin-stone should then be washed again on the strake, for in this
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way the material which has been run together is carried away by the water
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into the cross-trough, where it is gathered up and worked over, and again
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washed on the strake. </
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>By this method the metal is separated from that
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which is devoid of metal.</
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>Cakes from pyrites, or
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cadmía,
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or cupriferous stones, are roasted in quad
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rangular pits, of which the front and top are open, and these pits are generally
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twelve feet long, eight feet wide, and three feet deep. </
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>The cakes of melted
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pyrites are usually roasted twice over, and those of
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cadmía
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once. </
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>These latter
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are first rolled in mud moistened with vinegar, to prevent the fire from con
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suming too much of the copper with the bitumen, or sulphur, or orpiment, or
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realgar. </
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>The cakes of pyrites are first roasted in a slow fire and afterward in
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a fierce one, and in both cases, during the whole following night, water is let in, </
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