A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . sult obtained is, that the heavier and coarsergrains are found at the bottom of the buckets, whilst the lighter and finer matters held insuspension are poured out of the buckets and flow away through a launder provided for thatpiirpose. The stuff remaining in the bottom of the buckets is washed out by means of jetsof water obtained from a pressure-column ten feet in height, and passes directly into thefunnel of a round buddle. The wheel a, fir/. 492, is four fee
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . sult obtained is, that the heavier and coarsergrains are found at the bottom of the buckets, whilst the lighter and finer matters held insuspension are poured out of the buckets and flow away through a launder provided for thatpiirpose. The stuff remaining in the bottom of the buckets is washed out by means of jetsof water obtained from a pressure-column ten feet in height, and passes directly into thefunnel of a round buddle. The wheel a, fir/. 492, is four feet in diameter, two feet six inches in breadth ; hastwenty-four buckets, and makes five revolutions per minute ; b, launder for supplying thefinely-pulverized ore; c, pressure-column; n, jet-piece ; e, launder for conveying off theslime overflow of the wheel; f. launder for conveying roughs to round buddle. A modifi-cation of apparatus is employed at the Wildberg mines in Germany, where it has beenrecently introduced, and is found to succeed admirably for the classification of finely-dividedores. ORES, DRESSING OF. 492 855. 493 Sizing Cistern.—The tails from round buddies are sometimes passed through this appa-ratus. It consists, fig. 493, of a wooden box provided with an opening at the bottom, a,which is in communication with a pres-sure-pipe, B, an outlet, c, and has a smallregulating sluice, d. The stuff from thebuddies enters at E, and the pressure inthe columns is so regulated as to allow theheavier particles of the stuff to descend,but at the same time to wash away at fthe lighter matters that may be associatedwith the ore. This is done by havingthe outlet c of less area than the inlet,and fixing on the extremity d a con-venient regulating sluice, by which meansa greater or less quantity of stuff may bepassed over the depression f. Two cis-terns of this kind are generally employed,the second being used to collect anyrough particles that may have passed offfrom the
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