. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 265.—Acid Pump of Hard Rubber, orCopper. Barrel, WITH Rubber PlungerAND Rubber Valve. Fig. 266.—Acid Pump of Wood andRubber. The branch pipe (c) reaches above the rim of the tank, and ends in arubber hose which is provided with a clamp. In precipitating, the streamof calcium sulphide can be regulated, and the operator, by observing thecolour produced by the precipitant in the moving liquor, can, after somepractice, finish the operation quickly and more effectually than by
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 265.—Acid Pump of Hard Rubber, orCopper. Barrel, WITH Rubber PlungerAND Rubber Valve. Fig. 266.—Acid Pump of Wood andRubber. The branch pipe (c) reaches above the rim of the tank, and ends in arubber hose which is provided with a clamp. In precipitating, the streamof calcium sulphide can be regulated, and the operator, by observing thecolour produced by the precipitant in the moving liquor, can, after somepractice, finish the operation quickly and more effectually than by theuse of buckets. 4o6 MACHINKRY FOR METALLIFEROUS ]\IINES. One man can precipitate three tanks at a time ; and owing to thethorough agitation of the liquid a perfect separation of the silver sulphidecan be obtained; so much so, that the bottom of the tank can bedistinctly seen through 5 ft. of solution. Add Pumps.—The strongly acidulated waters required in the leachingprocess necessitates the use of an acid pump, such as that shown in fig. 265,which is built of hard rubljer or copper—by preference the f
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