Agricola, Georgius
,
De re metallica
,
1912/1950
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pegs or wedges driven into them. </
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<
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>The vitriol adheres to these laths, and
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within the space of a few days congeals into cubes, which are taken away
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and put into a chamber having a sloping board floor, so that the moisture
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which drips from the vitriol may flow into a tub beneath. </
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<
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>This solution is
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re-boiled, as is also that solution which was left in the twelve tubs, for, by
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reason of its having become too thin and liquid, it did not congeal, and was
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thus not converted into vitriol.</
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>A—WOODEN TUB. B—CROSS-BARS. C—LATHS. D—SLOPING FLOOR OF THE CHAMBER.
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E—TUB PLACED UNDER IT.</
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>The fourth method of making vitriol is from vitriolous earth or stones.
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>Such ore is at first carried and heaped up, and is then left for five or six months
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exposed to the rain of spring and autumn, to the heat of summer, and to the
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rime and frost of winter. </
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>It must be turned over several times with shovels,
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so that the part at the bottom may be brought to the top, and it is thus
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ventilated and cooled; by this means the earth crumbles up and loosens,
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and the stone changes from hard to soft. </
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<
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>Then the ore is covered with a roof,
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or else it is taken away and placed under a roof, and remains in that place
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six, seven, or eight months. </
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>Afterward as large a portion as is required is
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thrown into a vat, which is half-filled with water; this vat is one hundred </
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