A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . the hasps e e are loosened, and the bar dwith the dolly suddenly withdrawn. The tub is then packed by striking its outside withheavy wooden mallets. When this operation is terminated, the water is poured off throughplug-holes in the side of the tub. The object of the rotary motion created by thedolly is to scour off clayey or other matter ad-hering to the ore, whilst the packing hastens thesubsidence of the denser portions. In one opera-tion of this kind four di
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . the hasps e e are loosened, and the bar dwith the dolly suddenly withdrawn. The tub is then packed by striking its outside withheavy wooden mallets. When this operation is terminated, the water is poured off throughplug-holes in the side of the tub. The object of the rotary motion created by thedolly is to scour off clayey or other matter ad-hering to the ore, whilst the packing hastens thesubsidence of the denser portions. In one opera-tion of this kind four distinct strata may be pro-cured, as indicated by the lines a b, c d, cf, g /;,c , iuyfr/. 535. The upper portion, viz. from a to b, will prob-ably have to be set aside for further washing,whilst the schlich c should be fit for conical nucleus in the centre of the tubgenerally consists of coarse sand, and is usuallyfurther enriched on a copper bottom sieve, orelse submitted to the action of a tye, or othersuitable apparatus. ILtcfiine Dollg Tub.—This keeve is packedby machinery represented in the accompanying 584.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
