. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . lution to the reservoir tank. A hose is also attached to the inlet pipeand water is pumped in under pressure, and the leaching commences. The air in the toj)part of the barrel is compressed and forms an elastic cushion, which gives the wash-waterjierfect freedom to circulate evenlv over the whole surface of the charge, and wash every portionof it thoroughlv and with the smallest quantitv of water possible. The lengt
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . lution to the reservoir tank. A hose is also attached to the inlet pipeand water is pumped in under pressure, and the leaching commences. The air in the toj)part of the barrel is compressed and forms an elastic cushion, which gives the wash-waterjierfect freedom to circulate evenlv over the whole surface of the charge, and wash every portionof it thoroughlv and with the smallest quantitv of water possible. The length of time requiredto do the leaching varies with the leaching qiialitv of the ore treated—charges having beenleached in 40 min. with a pressure of from 30 lbs. to 40 lbs. per sq. in. With higher pressuresthe time can be materially shortened. In order to facilitate the leaching of charges carryingan excess of slimes, a valve placed in the head of the barrel, on a level with the surface of thepulp, is opened just after the barrel is stopped, and the dust and slime which remain insuspension are run off into an outside washing filter-press, where it can be treated Fig. 4.—The Thies chlorinating barrel. The tailings are discharged into a car which will hold the whole charge of ore and water, andthen run out ; or, if water is abundant, they are discharged into a sluice and washed away. 518 MILLS, GOLD. The amount of water required for leaching is about 120 gals, per ton more than the quantitynsed in tlie barrel for chlorination, which is about 100 gals, per ton. In order to get aconcentrated solution for after-treatment, to reduce the amount of solution to be treated,and to save water, a tank is placed aliove the barrel, and when the richest of the solutionand wash-water has run into the reservoir tank the discharge hose is connected with thepipe leading to the upper tank, and the washing is finished into it. The solution collected inthis way is used in the next foll
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