. De re metallica. Metallurgy; Mineral industries. ROOK VI. 195 shaft, which slopes and twists Hke a screw and gradually descends. The lowest of these machines is set in a deep place, which is distant from the surface of the ground 660 feet. The fourth species of pump belongs to the same genera, and is made as follows. Two timbers are erected, and in openings in them, the ends of a barrel revolve. Two or four strong men turn the barrel, that is to say, one or two pull the cranks, and one or two push them, and in this way help the others ; alternately another two or four men take their place. T
. De re metallica. Metallurgy; Mineral industries. ROOK VI. 195 shaft, which slopes and twists Hke a screw and gradually descends. The lowest of these machines is set in a deep place, which is distant from the surface of the ground 660 feet. The fourth species of pump belongs to the same genera, and is made as follows. Two timbers are erected, and in openings in them, the ends of a barrel revolve. Two or four strong men turn the barrel, that is to say, one or two pull the cranks, and one or two push them, and in this way help the others ; alternately another two or four men take their place. The barrel of this machine, just like the horizontal axle of the other machines, has a drum whose iron clamps catch the hnks of a drawing-chain. Thus water is drawn through the pipes by the balls from a depth of forty-eight feet. Human strength cannot draw water higher than this, because such very heavy labour exhausts not only men, but even horses ; only water-power can drive continuously a drum of this kind. Several pumps of this kind, as of the last, are often built for the purpose of mining on a single vein, but they are arranged differently for different positions and A—Axles. B—Levers. C—Toothed drum. D—Drum made of rundles, E—Drum in which iron clamps are 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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