286 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE  [VOL. XI 
the tailing now depleted of valuable sulphide is allowed to escape through 
valve ‘‘K”’. The agitators in the mixing compartments are driven at a 
peripheral speed of 1,500 linear feet per minute. 
The machine may be constructed with six, eight, or more agitators 
and may have a capacity anywhere from 50 to 100 tons of ore per 24 
hours. 
HOOVER VALIVELESS APPARATUS 
MINERALS SEPARATION PROCESS 
CALLOW PNEUMATIC FLOTATION PROCESS. 
This process of flotation is illustrated in Figure 3 and may be easily 
followed by the following description: The preparation of the pulp by 
violent agitation is not essential for this process; the ore from the pulver- 
Compressed Air 
20 /ébs. pressure 
On. TANK 
Feed Cleaner Tails Returned 
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Coflow Preumatic Flotation Frocess 
izing machine passes into the mixing tank ‘‘A”’ along with the necessary 
oil and acid, while compressed air.is blown through the pulp in the 
