. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. the ore of argentiferous lead680. METALLURGY. 825 Eire made to vibrate alternately upon their axes. The small ore is put into the upperpart of the chest a, over which a stream of water falls from an adjoining conduit. Thefragments which cannot pass through a cast iron grid in the bottom of that chest, aresorted by hand upon a table in front of A, and they are classed by the workman, eitheramong the ores to be stamped, whether dry or wet, or among the rubbish to be thrownawa)^, or am
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. the ore of argentiferous lead680. METALLURGY. 825 Eire made to vibrate alternately upon their axes. The small ore is put into the upperpart of the chest a, over which a stream of water falls from an adjoining conduit. Thefragments which cannot pass through a cast iron grid in the bottom of that chest, aresorted by hand upon a table in front of A, and they are classed by the workman, eitheramong the ores to be stamped, whether dry or wet, or among the rubbish to be thrownawa)^, or among the copper ores to be smelted by themselves. As to the small particleswhich fall through the grid upon the chest b, supplied also with a stream of water, theydescend successively upon two other brass wire sieves, and also through the iron wire r,in the bottom of b. In certain mines of the Hartz, tables called ci balais, or sweeping tables, are whole of the process consists in letting flow, over the sloping table, in successivecurrents, water charged with the ore, Avhich is deposited at a less or greater distance, asalso pur
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
