. De re metallica. Metallurgy; Mineral industries. BOOK A—Caldron. B—^Tank. C—Cross-bars. D—Ropes. E—Little stones. By the third method vitriol is made out of melanteria and sory. If the mines give an abundant supply of melanteria and sory, it is better to reject the chalcitis, and especialty the misy, for from these the vitriol is impure, particularly from the misy. These materials having been ,dug and thrown into the tanks, they are first dissolved with water ; then, in order to recover the pyrites from which copper is not rarely smelted and which forms a sedi- ment at the bottom of th
. De re metallica. Metallurgy; Mineral industries. BOOK A—Caldron. B—^Tank. C—Cross-bars. D—Ropes. E—Little stones. By the third method vitriol is made out of melanteria and sory. If the mines give an abundant supply of melanteria and sory, it is better to reject the chalcitis, and especialty the misy, for from these the vitriol is impure, particularly from the misy. These materials having been ,dug and thrown into the tanks, they are first dissolved with water ; then, in order to recover the pyrites from which copper is not rarely smelted and which forms a sedi- ment at the bottom of the tanks, the solution is transferred to other vats, which are nine feet wide and three feet deep. Twigs and wood which float on the surface are lifted out with a broom made of twigs, and afterward all the sediment settles at the bottom of this vat. The solution is poured into a rectangular leaden caldron eight feet long, three feet wide, and the same in depth. In this caldron it is boiled until it becomes thick and viscous, when it is poured into a launder, through which it runs into another leaden caldron of the same size as the one described before. When cold, the solution is drawn off through twelve little launders, out of which it flows into as many wooden tubs four and a half feet deep and three feet wide. Upon these tubs are placed perforated crossbars distant from each other from four to six digits, and from the holes hang thin laths, which reach to the bottom, with. 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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