12 2 



Tlie Phosphates of America. 



There are two rolls, R R, of chrome steel, 8 inches in diameter 

 by 6-inch face, weighing about 80 pounds each. They are held free 

 in position by the discs between their drivers and the rear ends of 

 the arm. 



The fan-blades F F, four in number, are of steel or 

 wrought-iron and are firmly fastened on each disc exteriorly by 

 the disc-bolt and dowel-pin, and distribute the material to be pul- 

 verized into the path of the rolls. 



Four liners, L L, or thin steel plates are placed between the 



VIEW OF TRANSVERSE VERTICAL SECTION OF FRISBEE-LUCOP PHOSPHATE MILL. 



ends of the rolls and the discs (cut to receive them) and take the 

 wear off the ends of the rolls. 



The revolving parts of the mill centred within the ring have 

 all a uniform motion with the shaft, but the rolls have an inde- 

 pendent motion around their axes. The ring G G is of rolled 

 steel, 6 inches face and 3 inches in thickness, held in position by 

 wedge-keys K K to the casing of the mill C C. Exterior to 

 the " centre " are two small circulating fans (wrought blades in a 

 cast hub), the purpose of which is to keep the pulverized material 

 in circulation so that it may be readily withdrawn by the exhaust- 

 fan which carries the product of the mill to the settling-bins. 



The casing of the mill is of cast-iron, divided horizontally. 



