. De re metallica. Metallurgy; Mineral industries. BOOK VI. 163. A—Upright axle. B—Block. C—Roof beam. D—Wheel. E—Toothed-drum. F—Horizontal axle. G—Drum composed of rundles. H—Drawing rope. I—Pole. K—Upright posts. L—Cleats on the wheel. wheel made of thick planks joined firmly together, and at its upper end a toothed drum ; this toothed drum turns another drum made of rundles, which is on a horizontal axle. A winding-rope is wound around this latter axle, which turns in iron bearings set in the beams. So that they may not fall, the two workmen grasp with their hands a pole fixed to two uprig
. De re metallica. Metallurgy; Mineral industries. BOOK VI. 163. A—Upright axle. B—Block. C—Roof beam. D—Wheel. E—Toothed-drum. F—Horizontal axle. G—Drum composed of rundles. H—Drawing rope. I—Pole. K—Upright posts. L—Cleats on the wheel. wheel made of thick planks joined firmly together, and at its upper end a toothed drum ; this toothed drum turns another drum made of rundles, which is on a horizontal axle. A winding-rope is wound around this latter axle, which turns in iron bearings set in the beams. So that they may not fall, the two workmen grasp with their hands a pole fixed to two upright posts, and then pushing the cleats of the lower wheel backward with their feet, they revolve the machine ; as often as they have drawn up and emptied one bucket full of excavated material, they turn the machine in the opposite direction and draw out another. The fourth machine raises burdens once and a half as large again as the two machines first explained. When it is made, sixteen beams are erected each forty feet long, one foot thick and one foot wide, joined at the top with clamps and widely separated at the bottom. The lower ends of all of them are mortised into separate sills laid flat upon the ground ; these sills are five feet long, a foot and a half wide, and a foot thick. Each beam is also connected with its sill by a post, whose upper end is mortised into the beam. 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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