444 CEMENTS, LIMES, AND PLASTERS. 



and is carried on the ring past the other rolls, being held against the 

 ring by centrifugal force, due to the speed of revolution, until the par- 

 ticles are reduced to the mesh desired, when they fly off of theii own 

 lightness and float inward and fall by gravitation, or pass outward 

 between the free and fixed rings, into the chamber E and down there 



FIG. 95. Interior of Kent mill. 



through to the outlet F. On entering the mill the charge is set in 

 rapid revolution therein, and is kept revolving until all is reduced. This 

 action is the same whether the charge is great or small. The charge 

 cushions the operation of the mill, the greater the feed the less being 

 the noise and vibration. 



Gravity doors giving an intermittent feed close the casing against 

 escape of dust. These open every time the weight fed on them is enough 

 to tilt them. The discharge flows out in a large continuous stream of 

 the size for which the mill is adjusted. 



