. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ce they aretransferred into the troush e, andwater is run upon them by turningtwo stopcocks for each trough. Thesand thus diffused upon each table,runs off with the water by a groove /, comes upon a sieve /;, spreads itself upon theboard g, and thence falls into the slanting chest, or sleepins; table i k. The under surfacek of this chest is pierced with holes, which may be stopped at pleasure with woodenplugs. There is a conduit m, at the lower end of each table, to catch the light
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ce they aretransferred into the troush e, andwater is run upon them by turningtwo stopcocks for each trough. Thesand thus diffused upon each table,runs off with the water by a groove /, comes upon a sieve /;, spreads itself upon theboard g, and thence falls into the slanting chest, or sleepins; table i k. The under surfacek of this chest is pierced with holes, which may be stopped at pleasure with woodenplugs. There is a conduit m, at the lower end of each table, to catch the light par-ticles carried off by the water out of the chest i k, throua;h the holes properly opened,while the denser parts are deposited upon the bottom of this chest. A general conduitn passes across at the foot of all the chests i k ; it receives the refuse of the washingoperations. Fig. 679 is a set of stamping and washing works for the ores of argentiferous galena,as mounted at Bockwiese, in the district of Zellerfeldt, in the Hartz. A is the stamp mill and its subsidiary parts; among which are a, the drivin o. 824 METALLURGY. main - shaft; b, the overshot water-wheel; c c, six strong rings or hoops of cast iron,for receiving each a cam or tappet; g, the brake of the machine; k, k, k, the three standards of the stamps ; 11, &c. six pestles of pinewood, shod with lumps of cast iron. There aretwo chests, out of which the ore to be ground fallsspontaneously into the two troughs of the late years, however, the ore is mostly suppliedby hand; the water-course terminates a short dis-tance above the middle of the Avheel 6. There isa stream of water for the service of the stamps,and conduits proceeding from it, to lead the waterinto the two stamp troughs; the conduit of dis-charge is common to the two batteries or sets ofstamps through which the water carries oft thesand or stamped ore. There is a moveable tableof separation, mounted with two sieves. Thesands pass immediately int
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
