. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e-power when accomplishing its remarkable duty. The Cornish Pumping Engine.—The following description ofthe modern form of the Cornish pumping engine is chiefly taken fromAndres Treatise on Coal Mining.* The cylinder (f), fig 75, is70 in. in diameter, with a lo-ft. piston stroke. It is provided with acast iron steam jacket, connected with the boilers by the pipe (h), fig. boilers are situated below the pipe (h) so that the water of con-densation returns by it. Where the
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e-power when accomplishing its remarkable duty. The Cornish Pumping Engine.—The following description ofthe modern form of the Cornish pumping engine is chiefly taken fromAndres Treatise on Coal Mining.* The cylinder (f), fig 75, is70 in. in diameter, with a lo-ft. piston stroke. It is provided with acast iron steam jacket, connected with the boilers by the pipe (h), fig. boilers are situated below the pipe (h) so that the water of con-densation returns by it. Where the boilers, from unavoidable circum-stances, are above the cylinder, the supply pipe to the steam jacketcannot serve as a return condensed water pipe, and provision must * London : E. & F. N. Spon. io6 MACHINERY FOR METALLIFEROUS MINES. be made for freeing the jacket from condensed water by means of asteam trap. The steam jacket is encased in wood; the annular spacebetween the two is filled with some non-conducting medium, such assawdust, and the whole is enclosed in brickwork, either in contact Scale of FeeL. Fig. 75.—The Cornish Pumping Engine. with the casing, or separated from it by a few inches, and is plasteredon the outside, the plaster being covered with wood panelling. Thecylinder cover is fitted with a false lid or cap, which encloses a thicklayer of sawdust, and is thus protected from the cooling influence of THE CORNISH PUMP. 107 the air. The space under the cyhnder bottom is protected from thesame influence by steam filling it from a branch of the pipe (h). c isthe main beam, cast in two plates, which are bolted together withdistance blocks between them to keep them truly parallel. A catchpiece (a) is fixed to the upper part of the beam by meansof brackets. On the piston reaching the bottom of its stroke, thecatchpiece touches the blocks (b) fixed on the spring beams, arrestingthe piston, and thus preventing injury to the cylinder by the enginemaking too long an i
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