. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 315 This method of washing has lately undergone a considerable change ; for the launtUT which carries the water, mixed with the crushed tin-stone and fine sand which flow from the openings of the screen, does not reach to a transverse trough which is inside the same room, but runs straight through a partition into a small settling-pit. A boy draws a three-toothed rake through the material which has settled in the portion of the launder outside the room, by which means the larger sized particles of tin-stone settle at the bottom, and
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 315 This method of washing has lately undergone a considerable change ; for the launtUT which carries the water, mixed with the crushed tin-stone and fine sand which flow from the openings of the screen, does not reach to a transverse trough which is inside the same room, but runs straight through a partition into a small settling-pit. A boy draws a three-toothed rake through the material which has settled in the portion of the launder outside the room, by which means the larger sized particles of tin-stone settle at the bottom, and these the washer takes out with the wooden shovel and carries into the room ; this material is thrown into an ordinary strake and swept with a wooden scrubber and washed. As for those tin-stone particles which the water carries off from the strake, after they have been brought back on to the strake, he washes them again until they are clean. The remaining tin-stone, mixed with sand, flows into the small settling-pit which is within the building, and this discharges into two large buddies. The tin-stone of moderate size, mixed with those of fairly large size, settle in the upper part, and the small size in the lower part ; but both are impure, and for this reason they are taken out separately and th? former is washed twice,. A—First launder. B—Three-toothed rake. C—Small settling pit. D—Large BUDDLE. E—BUDDLE RESEMBLING THE SIMPLE BUBBLE. F—SmALL ROLLER- G— Boards. H—Their holes. I—Shovel. K—Building. L—Stove. (This picture DOES NOT entirely AGREE WITH THE TEXT).. 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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