. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 341. A—Strakes. B—Tank. C—Launder. D—Plug. E—Wooden shovel. F—Wooden mallet. G—Wooden shovel with short handle. H—The plug IN the strake. I—Tank placed under the plug. of the loaded strake with a vi'ooden mallet, in order that the tin-stone clinging to the sides may fall off ; all that has settled in it, he throws out with a wooden shovel which has a short handle. Silver slags which have been crushed under the stamps, also fragments of silver-lead alloy and of cakes melted from pyrites, are washed in a strake of this kind. Material
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 341. A—Strakes. B—Tank. C—Launder. D—Plug. E—Wooden shovel. F—Wooden mallet. G—Wooden shovel with short handle. H—The plug IN the strake. I—Tank placed under the plug. of the loaded strake with a vi'ooden mallet, in order that the tin-stone clinging to the sides may fall off ; all that has settled in it, he throws out with a wooden shovel which has a short handle. Silver slags which have been crushed under the stamps, also fragments of silver-lead alloy and of cakes melted from pyrites, are washed in a strake of this kind. Material of this kind is also washed while wet, in a sieve whose bottom is made of woven iron wire, and this is the fourth method of washing. The sieve is immersed in the water which is contained in a tub, and is violently shaken. The bottom of this tub has an opening of such size that as much water, together with tailings from the sieve, can flow continuously out of it as water flows into it. The material which settles in the strake, a boy either digs over with a three-toothed iron rake or sweeps with a wooden scrubber ; in this way the water carries off a great part of both sand and mud. The tin-stone or metalliferous concentrates settle in the strake and are afterward washed in another strake. These are ancient methods of washing material which contains tin- stone ; there follow two modern methods. If the tin-stone mixed 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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