. De re metallica. Metallurgy; Mineral industries. 3o6 BOOK VIII. little scrubber, which has a handle of half the length, and with this he cease- lessly stirs the concentrates or tin-stone which have settled in the upper part of the strake; in this way the mud and water flow down into the transverse launder, and from it into the setthng-pit which is outside the building. Before the short strake and the jigging-sieve had been invented, metallifer- ous ores, especially tin, were crushed dry with stamps and washed in a large trough hollowed out of one or two tree trunks ; and at the head of this
. De re metallica. Metallurgy; Mineral industries. 3o6 BOOK VIII. little scrubber, which has a handle of half the length, and with this he cease- lessly stirs the concentrates or tin-stone which have settled in the upper part of the strake; in this way the mud and water flow down into the transverse launder, and from it into the setthng-pit which is outside the building. Before the short strake and the jigging-sieve had been invented, metallifer- ous ores, especially tin, were crushed dry with stamps and washed in a large trough hollowed out of one or two tree trunks ; and at the head of this trough was a platform, on which the ore was thrown after being completely crushed. The washer pulled it down into the trough with a wooden scrubber which had a long handle, and when the water had been let into the trough, he stirred the ore with the same A—Trough. B—Platform. C—Wooden scrubber. The short strake is narrow in the upper part where the water flows down into it through the little launder ; in fact it is only two feet wide ; at the lower end it is wider, being three feet and as many palms. At the sides, which are six feet long, are fixed boards two palms high. In other respects the head resembles the head of the simple buddle, except that it is not depressed in the middle. Beneath is a cross launder closed by a low board. In this short strake not only is ore agitated and washed with a wooden scrubber, but boys. 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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