Draining mine workings by means of a battery of three pumps. The axle, B, is powered by an overshot water wheel. The cams on the axle raise and lower the piston rods by means of tappets. C is the bottom of the pipe which is encased in the basket, D. From "De re metallica", by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut. (Photo by: Universal History Archive/UIG via Getty Images)
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達志影像
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