MILLS AND FOOD MACHINERY 33 



A very powerful grit machine is that in Figure 

 41. It does rapid work with crockery, glass or shells, 

 crushing them with an action much like that of a pair 

 of strong jaws. The grinders are the six-foot arms, 

 d d, shod with roughened iron plates above the pivots 

 at I, and moved to and fro by means of the lever, K. 



The frame, a b a b, is four by five feet, made of tim- 

 ber four by six inches. The hopper, / /, is one foot 

 deep. The pivots at /, b f e, e, are stout bolts set to play 

 freely, but the bolt at g i is screwed tight. The small 

 side drawing shows construction of grinder arms. 



