. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e found in a work by Mr. StephenMichell on Mine Drainage.* It will be sufificient for ourpurpose, however,if I describe thepumps used in amill erected by my-self and which Ifound to work verysatisfactorily. Atfirst the only pumpin use was one ofthe California typeand of Germanmake (fig. 104) driven by a belt and gearing; but this was of a de-fective construction and was constantly getting out of order, and withthe enlargement of the mill was found insufficient to keep up thesup
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e found in a work by Mr. StephenMichell on Mine Drainage.* It will be sufificient for ourpurpose, however,if I describe thepumps used in amill erected by my-self and which Ifound to work verysatisfactorily. Atfirst the only pumpin use was one ofthe California typeand of Germanmake (fig. 104) driven by a belt and gearing; but this was of a de-fective construction and was constantly getting out of order, and withthe enlargement of the mill was found insufficient to keep up thesupply of water required in a large lead-dressing mill. A duplex pumpwas therefore ordered from the Pulsometer Engineering Company, ofLondon, large enough to keep up the full supply of the mill if necessary,but the old California pump was also kept running at a slow speed,doing what it could, and as it was driven by water-power, it kept downthe expense of the steam pumping of the duplex. The duplex pump consists of two pumps and two cylinders placedside by side. The slide valves are of the well-known ordinary .—The DuiLEX Pump. * London : Crosby Lockwood & Son. DUPLEX STEAM PUMPS. 147 The action of the pump (fig. 106) is as follows : When the firstpump is at the end of its stroke the piston rod of its fellow pump,by means of a swinging lever, actuates its slide valve, so as to giveit steam at the other end of the cylinder, after which the second pumpcompletes its own stroke and waits for the first pump, now in courseof its stroke, to give steam in a similar manner. One of the steamvalves is always open, so that there is no dead centre, and greatsteadiness and freedom from shocks is obtained by the use of the twodouble acting pumps, the water being delivered in a constant stream. The pumps are of the internal plunger type, and the plungers arepacked by removing the end cylinder covers. If asbestos packing isused it will be found to last for a long period without changing,
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