. De re metallica. Metallurgy; Mineral industries. 194 BOOK VI. mortised at the lower end a short board ; this has an iron key which engages a chain, and this chain again a pole-bar. This machine, which draws water from a shaft two hundred and forty feet deep, is worked by thirty-two horses; eight of them work for four hours, and then these rest for twelve hours, and the same number take their place. This kind of machine is employed at the foot of the Harz^^ mountains and in the neighbourhood. Further, if necessity arises, several pumps of this kind are often built for the purpose of mining on
. De re metallica. Metallurgy; Mineral industries. 194 BOOK VI. mortised at the lower end a short board ; this has an iron key which engages a chain, and this chain again a pole-bar. This machine, which draws water from a shaft two hundred and forty feet deep, is worked by thirty-two horses; eight of them work for four hours, and then these rest for twelve hours, and the same number take their place. This kind of machine is employed at the foot of the Harz^^ mountains and in the neighbourhood. Further, if necessity arises, several pumps of this kind are often built for the purpose of mining one vein, but arranged differently in different locahties varying according to the depth. At Schemnitz, in the Carpathian mountains, there are three pumps, of which the lowest lifts water from the lowest sump to the first drains, through which it flows into the second sump ; the intermediate one hfts from the second sump to the second drain, from which it flows into the third sump ; and the upper one hfts it to the drains of the tunnel, through which it flows away. This system of three machines of this kind is turned by ninety-six horses ; these horses go down to the machines by an inchned. A—Axle. B—Drum. C—Drawing-chain. D—Balls. E —Clamps. ^^Melihocian,—the 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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