STATE GEOLOGIST. HTT 
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Fig. 45. Griffin mill, cross-section. 
To the top of this a conical shield (25) is fastened open at the apex 
through which the shaft works. Just above the roll is the fan (17) which 
is used in the dry mill, but not in the wet. On the under side of the roll 
are shown shoes or plows (5) which are used in both and vary in shape 
according to the work to be done. 
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 revolving 
