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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
e built larger and smaller than the size mentioned. Including the coal of calcination, it is estimated that 3 1/2 tons of coal are required to obtain a ton of cast-iron. The proportions of the materials dumped into the furnace are 14 1/2 tons of coke, 16 of roasted ore, 6 3/4 tons of limestone, every 24 hours, producing 7 tons of pig-iron every 12 hours. Advantage is taken of a side-hill to make a convenient access for charging and delivering. Smelting-furnace of the Pacific States. Shropshire smelting-furnace. In the illustration, a represents the regulating-cylinder, 8 feet in diameter and hight; b, the floating piston, loaded with weights, proportionate to the power of the machine; c, a valve 26 inches long, 11 inches wide, by which the air is passed from the pumping-cylinder into the regulator; d, the aperture at which the blast is forced into the pipe leading to the tuyere. The pipe is 18 inches in diameter; the wider this can be made, the less is the friction and the
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
wn the stem is blown through, to insure that it shall not be a blind passage. Thence to the kiln. One set of hands will make 4 1/2 gross per day. The pipes are baked in a peculiar kiln. being arranged in crucibles or seggars, each of which has six horizontal ledges running around its interior. Upon these ledges rest the bowls of the pipes. while the stems lean against the central pillar. The top is covered in with a dome, and the crucible contains about 50 gross. Broseley, in Shropshire, on the banks of the Severn, has been for centuries a chief seat of the clay-pipe manufacture in England, pipes still extant bearing the date 1687, and the names of Richard Legg and John Legg on the bowls. Many of this family still follow the profession of pipe-makers in the quiet little old town. The collection of broseleys has been pursued by some ardent spirits with all the zeal which numismatists devote to their favorite subject, and the progressive alterations in form, and the vario