DRESSING OF ORES 



95 



No. of revolutions of stono per minute 

 Gauge of stuff in hopper . 

 Ditto on delivery. 

 Quantity of stuff ground per 10 hoars 

 Power employed in horses 

 Revolutions of sizing sieve 

 Diameter of ditto .... 

 Length of ditto . . 



No. of holes per square inch in sizing sieve 

 Character of runner .... 

 Ditto bed-stone .... 

 Duration of runner . . . 



Ditto bed-stone .... 

 When dressed . . . 



108. 



100 holes to the square inch. 

 3,600 ditto. 



1 ton per pair of stones. 

 About 5 per ditto. 

 23 per minute. 

 30 inches. 

 108. 

 3,600. 



Coarse conglomerate. 

 Compact quartz, moderately hard. 

 Average 18 weeks. 

 Ditto 22 ditto. 

 Every third day. 



672 



From a series of practical experiments made on the same stuff by horizontal, crush- 

 ing, and edge-mills, the following results have been obtained : 



