. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 287 the cam-shaft ; in this case the cams on both sides raise the stamps, which either both crush dry or wet ore, or else the one set crushes dry ore and the other set wet ore, just as circumstances require the one or the other ; further, when the one set is raised and the iron clavises in them are fixed into openings in the first cross-beam, the other set alone crushes the ore. Broken rock or stones, or the coarse or fine sand, arc removed from the mortar of this machine and heaped up, as is also done with the same materials when r
. De re metallica. Metallurgy; Mineral industries. BOOK VIII. 287 the cam-shaft ; in this case the cams on both sides raise the stamps, which either both crush dry or wet ore, or else the one set crushes dry ore and the other set wet ore, just as circumstances require the one or the other ; further, when the one set is raised and the iron clavises in them are fixed into openings in the first cross-beam, the other set alone crushes the ore. Broken rock or stones, or the coarse or fine sand, arc removed from the mortar of this machine and heaped up, as is also done with the same materials when raked out of the dump near the mine. They are thrown by a workman into a box, which is open on the top and the front, and is three feet long and nearly a foot and a half wide. Its sides are sloping and made of planks, but its bottom is made of iron wire netting, and fastened with wire to two iron rods, which are fixed to the two side planks. This bottom has openings, through which broken rock of the size of a hazel nut cannot pass ; the pieces which are too large to pass through are removed by the workman, who again places them under stamps, while those which have passed through, together with the coarse and fine sand, he collects in a large vessel and keeps for the washing. When he is performing his laborious. A—Box LAID FLAT ON THE GROUND. B—ItS BOTTOM WHICH IS MADE OF IRON WIRE. C—Box INVERTED. D—IrON RODS. E—BoX SUSPENDED FROM A BEAM, THE INSIDE BEING VISIBLE. F—BoX SUSPENDED FROM A BEAM, THE OUTSIDE BEING 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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