. De re metallica. Metallurgy; Mineral industries. BOOK VIII. A—Trough. B—Its open end. C—End th.^t may be closed. D—Stream. E—Hoe. F—End-board. G—Bag. with a small quantity of heavy sand, have settled in the trough, they wash in a bowl and collect in bags and carry away with them. Some people wash this kind of sand in a large bowl which can easily be shaken, the bowl being suspended by two ropes from a beam in a building. The sand is thrown into it, water is poured in, then the bowl is shaken, and the muddy water is poured out and clear water is again poured in, this being done again and agai
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. A—Trough. B—Its open end. C—End th.^t may be closed. D—Stream. E—Hoe. F—End-board. G—Bag. with a small quantity of heavy sand, have settled in the trough, they wash in a bowl and collect in bags and carry away with them. Some people wash this kind of sand in a large bowl which can easily be shaken, the bowl being suspended by two ropes from a beam in a building. The sand is thrown into it, water is poured in, then the bowl is shaken, and the muddy water is poured out and clear water is again poured in, this being done again and again. In this way, the gold particles settle in the back part of the bowl because they are heavy, and the sand in the front part because it is light ; the latter is thrown away, the former kept for smelting. The one who does the washing then returns immediately to his task. This method of washing is rarely used by miners, but frequently b}' coiners and goldsmiths when they wash gold, silver, or copper. The bowl they employ has only three handles, one of which they grasp in their hands when they shake the ^ I, and in the other two is fastened a rope by which the bowl is hung from earn, or from a cross-piece which is upheld by the forks of two upright posts fixed in the ground. Miners frequently wash ore in a smaU bowl to test. 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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