. De re metallica. Metallurgy; Mineral industries. BOOK IX. 373 they are a palm wide aiid two and a half digits thick, and it is necessary that they should be three digits apart, as were the rundles. The axle should have a thickness in proportion to the spokes and the segments. As it has two cams to depress each of the levers, it is necessary that it should have twenty-four cams, which project beyond it a foot and a palm and a digit. The cams are of almost semicircular shape, of which the widest part is three palms and a digit wide, and they are a palm thick ; they are distributed according to
. De re metallica. Metallurgy; Mineral industries. BOOK IX. 373 they are a palm wide aiid two and a half digits thick, and it is necessary that they should be three digits apart, as were the rundles. The axle should have a thickness in proportion to the spokes and the segments. As it has two cams to depress each of the levers, it is necessary that it should have twenty-four cams, which project beyond it a foot and a palm and a digit. The cams are of almost semicircular shape, of which the widest part is three palms and a digit wide, and they are a palm thick ; they are distributed according to the four sides of the axle, on the upper, the lower and the two lateral sides. The axle has twelve holes, of which the first penetrates through from the upper side to the lower, the second from one lateral side to the other ; the first hole is four feet two palms distant from the second ; each alternate one of these holes is made in the same direc- tion, and they are arranged at equal intervals. Each single cam must be opposite another ; the first is inserted into the upper part of the first hole, the second into the lower part of the same hole, and so fixed by pegs that they do not fall out ; the third cam is inserted into that part of the second hole which is on the right side, and the fourth into that part on the left. In hke manner all the cams are inserted into the consecutive holes, for which reason it happens that the cams depress the levers of the. A—Charcoal. B—Mortar-box. C— 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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