. De re metallica. Metallurgy; Mineral industries. BOOK XII. 563 librae of the latter. Shortly afterward the solution will be found to be clear and blue. It is boiled until the waters, which are easily volatile (sublilcs), are evaporated, and then the greater part of the salt, after it has settled at the bottom of tlie pan, is taken out with iron ladles. Then the concentrated solution is transferred to the vat in which rods are placed horizontally and vertically, to which it adheres when cold, and if there be much, it is condensed in three or four days into saltpetre. Then the solution which h
. De re metallica. Metallurgy; Mineral industries. BOOK XII. 563 librae of the latter. Shortly afterward the solution will be found to be clear and blue. It is boiled until the waters, which are easily volatile (sublilcs), are evaporated, and then the greater part of the salt, after it has settled at the bottom of tlie pan, is taken out with iron ladles. Then the concentrated solution is transferred to the vat in which rods are placed horizontally and vertically, to which it adheres when cold, and if there be much, it is condensed in three or four days into saltpetre. Then the solution which has not con- gealed, is poured out and put on one side or re-boiled. The saltpetre being cut out and washed with its own solution, is thrown on to boards that it may drain and dry. The yield of saltpetre will be much or little in proportion to whether the solution has absorbed much or little ; when the saltpetre has been obtained from lye, which purifies itself, it is somewhat clear and pure. The purest and most transparent, because free from salt, is made if it is drawn off at the thickening stage, according to the following method. There. A—Caldron B—Large vat into which sand is thrown. C- Plug. D—Tub E—Vat containing the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications
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