. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 349 teeth, and now again levelled down with a hoe, both of which are made of iron. The very fine tin-stone requires to be burned less than that of moderate size, and this again less than that of the largest size. While the tin-stone is being thus burned, it frequently happens that some of the material runs A—Furnace. B—Its mouth. C—Poker. D—Rake with two teeth. E—Hoe. The burned tin-stone should then be washed again on the strake, for in this way the material which has been run together is carried away by the water into t
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 349 teeth, and now again levelled down with a hoe, both of which are made of iron. The very fine tin-stone requires to be burned less than that of moderate size, and this again less than that of the largest size. While the tin-stone is being thus burned, it frequently happens that some of the material runs A—Furnace. B—Its mouth. C—Poker. D—Rake with two teeth. E—Hoe. The burned tin-stone should then be washed again on the strake, for in this way the material which has been run together is carried away by the water into the cross-trough, where it is gathered up and worked over, and again washed on the strake. By this method the metal is separated from that which is devoid of metal. Cakes from pyrites, or cadmia, or cupriferous stones, are roasted in quad- rangular pits, of which the front and top are open, and these pits are generally twelve feet long, eight feet wide, and three feet deep. The cakes of melted pyrites are usually roasted twice over, and those of cadmia once. These latter are first rolled in mud moistened with vinegar, to prevent the fire from con- suming too much of the copper with the bitumen, or sulphur, or orpiment, or realgar. The cakes of pyrites are first roasted in a slow fire and afterward in a fierce one, and in both cases, during the whole following night, water is let 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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