. De re metallica. Metallurgy; Mineral industries. 372 BOOK A—Axle. B—Water-wheel. C—Drum composed of rundles. D—Other axle. E—Toothed wheel. F—Its spokes. G—Its segments. H—Its teeth. I—Cams OF THE axle. segment, measured over its round back, is four feet and three palms long. There are four spokes, each two palms wide and a palm and a digit thick; their length, excluding the tenons, being two feet and three digits. One end of the spoke is mortised into the axle, where it is firmly fastened with pegs ; the wide part of the other end, in the shape of a triangle, is mortised into the outer
. De re metallica. Metallurgy; Mineral industries. 372 BOOK A—Axle. B—Water-wheel. C—Drum composed of rundles. D—Other axle. E—Toothed wheel. F—Its spokes. G—Its segments. H—Its teeth. I—Cams OF THE axle. segment, measured over its round back, is four feet and three palms long. There are four spokes, each two palms wide and a palm and a digit thick; their length, excluding the tenons, being two feet and three digits. One end of the spoke is mortised into the axle, where it is firmly fastened with pegs ; the wide part of the other end, in the shape of a triangle, is mortised into the outer segment opposite it, keeping the shape of the same as far as the segment ascends. They also are joined together with wooden pegs glued in, and these pegs are driven into the spokes under the inner disc. The parts of the spokes in the shape of the triangle are on the inside ; the outer part is simple. This triangle has two sides equal, the erect ones as is evident, which are a palm long ; the lower side is not of the same length, but is five digits long, and a mortise of the same shape is cut out of the segments. The wheel has sixty teeth, since it is necessary that the rundle drum should revolve twice while the toothed wheel revolves once. The teeth are a foot long, and project one palm from the inner disc of the wheel, and three digits from the outer disc;. 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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