. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. no equal. The duplexpump is really two pumps placed side by side on a common bed plate;the lever which receives motion from the piston rod of one pump actuates ii8 MACFIINKRY FOR METALLIFEROUS MINES. the steam valve of the opposite pump ; thus the motion of the piston,instead of operating its own sHdevalve—as in the single pump—givesmotion to the valve of the opposite cylinder. The valves are so arrangedthat when each plunger has completed its stroke it makes a momentarypause b
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. no equal. The duplexpump is really two pumps placed side by side on a common bed plate;the lever which receives motion from the piston rod of one pump actuates ii8 MACFIINKRY FOR METALLIFEROUS MINES. the steam valve of the opposite pump ; thus the motion of the piston,instead of operating its own sHdevalve—as in the single pump—givesmotion to the valve of the opposite cylinder. The valves are so arrangedthat when each plunger has completed its stroke it makes a momentarypause before restarting on the return stroke. During this pause thevalves quietly and noiselessly fall into their seats. The effect of this arrangement is that the plunger of one pump,having started and taken up the load of the water column, moves onto the end of its stroke, when the plunger of the second pump havingstarted, takes up in its turn the load of the water column. The pumpsbeing each double acting, a steady and continuous movement of thewater in the column is the result. This movement is easy in its flow. Fig. S3.—The Worthington Compound Packed Plunger Pump. and absolutely without the noise, jar, and recoil incident to the suddenstarting into motion or bringing to rest of a heavy column of water. The modern type of the Worthington pump, as used formine drainage, is shown in fig. 83. The limit of expansion by means of compound cylinders hadapparently been attained, with steam at ordinary pressures, in the above-described duplex direct acting steam pump. Further efficiency from cutting off and expanding the steam in eachcylinder by itself could only be gained by storing up energy in the earlypart of the stroke, and to do this, neither crank, flywheel, nor massivereciprocating parts could be used, as any of these devices well-knownwould have deprived the duplex engine of its vital points of superiorityand merit. The desired result was, however, secured by a very
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