. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ers. An important development of the stamp battery is the steam stamp,which works upon the principle of the steam hammer, running at the rateof go blows per minute, and capable of crushing fine a quantity of 150tons in 24 hours, and coarse 230 tons in the same time. This class of stainp is illustrated in fig. 183, and is built entirelyof iron and .steel. The entire framing of the machine consists of fourmassive cast iron columns, braced to one another, and securely boltedtogeth
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ers. An important development of the stamp battery is the steam stamp,which works upon the principle of the steam hammer, running at the rateof go blows per minute, and capable of crushing fine a quantity of 150tons in 24 hours, and coarse 230 tons in the same time. This class of stainp is illustrated in fig. 183, and is built entirelyof iron and .steel. The entire framing of the machine consists of fourmassive cast iron columns, braced to one another, and securely boltedtogether, and to the heavy cast iron rills or bed plates, with body-bound THE STEAM STAMP. 271 bolts. This rigid structure must always remain perfectly in line, and soavoids the excessive wear and tear which a less solid type of construc-tion would entail. The stamp is operated by a vertical steam cylinder, which can bemade of any diameter or length of stroke according to the capacityrequired. The shaft operating the valves by means of eccentrics androds, is worked by a pair of machine-cut elliptical steel spurwheels,. Fig. iS^.—The Steam Stamp. receiving their motion from a countershaft driven from the main mill-shafting by a belt. The object of employing elliptical gear is that thevalves may be moved in such a manner as to keep the top steam portfully open for admitting the full steam pressure during the down-stroke,and a small opening of the lower port during the up-stroke. The mortar has four discharge openings, and rests on a heavy cast ironanvil or bed plate, 20 in. thick, weighing about 11 tons, which is carried 272 MACHINERY FOR :\rETALLIFEROUS MINES. by the spring timbers tliat rest upon the lower sills. Between the anviland spring timber is a rubber cushion, i in, thick. The angle guide piecescast on the columns hold the mortar in place. These guides are planedand fitted with gibs adjustable by set-screws and jam nuts. Neithermortar nor anvil are held down by bolts, and t
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