. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. eans of which the mercurywas pumped back from the pansinto a reservoir at the top ofthe mill, and thence distributedin pipes to the various pumping of mercury, how-ever, entails considerable difficulty in practice, and is now being supersededby the use of an elevator of much the same form as the ordinary beltelevator. The remainder of the pipe system is the same as when a pumpwas used, starting from the receiving tank at the top of the mill. The elevator cups (b
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. eans of which the mercurywas pumped back from the pansinto a reservoir at the top ofthe mill, and thence distributedin pipes to the various pumping of mercury, how-ever, entails considerable difficulty in practice, and is now being supersededby the use of an elevator of much the same form as the ordinary beltelevator. The remainder of the pipe system is the same as when a pumpwas used, starting from the receiving tank at the top of the mill. The elevator cups (b b) are made of Russian iron, and are of thepeculiar shape shown in fig. 267, which is especially adapted for carryingquicksilver. The lower pulley (p) and bearings are carried by a cast ironboot, to which, and extending up to and around the upper pulley, isattached a wooden, or, preferably, a sheet iron casing (r), the joints ofwhich must be made perfectly tight in order to avoid loss of anyquicksilver spilled from the cups. The upper tank (t) receives all thequicksilver, and like the lower is made of cast Fig. 267.—Quicksilver Elevator. BELT ELEVATORS. 407 The distributing pipe (l) leads off from the bottom, and from thisthe other pipes branch off as required. The tank (m), shown in plan andsection, is a receiving tank made of cast iron, in which the quicksilverreturned from the mill is collected previous to being again elevated. The amalgam in the pans and elsewhere in the mill is collectedin lock-up sheet iron safes of a portable form ; and in large mills sheetiron cars running on rails are used. These, however, as well as thedistilling and smelting furnaces, can hardly be classed as machinery, andthe reader is referred to the books already mentioned for the details ofdistilling mercury, assaying ore, and smelting bullion. Ore Elevators.—TY/f BeltElevator.—In the designing andarranging of concentration millsof all types, the one great pointto be kept in view is
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