CRUSHING AND PULVERIZING MACHINERY. 



441 



The lubricating oil is supplied for all parts needing it through the 

 hollow pin (12). 



The roll is revolved within the die in the same direction that the 

 shaft is driven, but when coming in contact with the die it travels around 

 the die in the opposite direction from that in which the roll is revolv- 



FIG. 94. Section of Griffin mill. 



ing with the shaft, thus giving the mill two direct actions on the material 

 to be ground. There is a pressure by centrifugal force of 6000 Ibs. 

 brought to bear on the material being pulverized between the roll and 

 die, the united actions being very effective in their combination. 



