Agricola, Georgius
,
De re metallica
,
1912/1950
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librae
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of the latter. </
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<
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>Shortly afterward the solution will be found to be clear
<
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and blue. </
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<
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>It is boiled until the waters, which are easily volatile (
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subtiles
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), are
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evaporated, and then the greater part of the salt, after it has settled at the
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bottom of the pan, is taken out with iron ladles. </
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<
s
>Then the concentrated
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solution is transferred to the vat in which rods are placed horizontally and
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vertically, to which it adheres when cold, and if there be much, it is condensed
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in three or four days into saltpetre. </
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<
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>Then the solution which has not con
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gealed, is poured out and put on one side or re-boiled. </
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<
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>The saltpetre being
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cut out and washed with its own solution, is thrown on to boards that it may
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drain and dry. </
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>
<
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>The yield of saltpetre will be much or little in proportion
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to whether the solution has absorbed much or little; when the saltpetre
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has been obtained from lye, which purifies itself, it is somewhat clear and
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pure.</
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<
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>The purest and most transparent, because free from salt, is made if it is
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drawn off at the thickening stage, according to the following method. </
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<
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>There </
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<
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<
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>A—CALDRON. B—LARGE VAT INTO WHICH SAND IS THROWN. C—PLUG. D—TUB.
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E—VAT CONTAINING THE RODS.</
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