DRESSING OF ORES 



123 



The wheel A, fig. 703, is 4 feet in diameter, 2 feet 6 inches in breadth ; it has twenty- 

 four buckets, and makes five revolutions per minute ; n, launder for supplying the 



finely-pulverised ore ; c, pressure-column ; D, jet-piece ; E, launder for conveying away 

 the slime overflow of the wheel ; F, launder for taking roughs to round bucklle. 



Sizing Cistern. The tails from 

 round buddies are sometimes passed 

 through this apparatus. It con- 

 sists, fig. 704, of a wooden box pro- 

 vided with an opening at the bot- 

 tom, A, which is in communication 

 with a pressure-pipe, B, an outlet, 

 c, with a small regulating sluice, 

 D. The stuff from the buddies enters 

 at E, and the pressure in the column 

 is so regulated as to allow the 

 heavier particles of the stuff to de- 

 scend, but at the same time to wash 

 away at F the lighter matters that 

 may be associated with the ore. 

 This is done by having the outlet c 

 of less area than the inlet, and fix- 

 ing on the extremity D a convenient regulating sluice by which means a greater or 

 less quantity of stuff may bo passed over the weir F. Two cisterns of this kind are 



705 



generally employed, the second being used to collect any rough particles that may have 

 passed off from the first. The depth of a box may be 18 inches, its width 13 inches, 

 and its length 3 feet 6 inches. 



