58 



The feeding arms (iig. 7, e) are placed spirally around the shaft {d)^ 

 so that onh' one is delivering fruit at the same moment, but this posi- 

 tion insures a constant feed, and the size of the slots is such that no 

 whole fruit can be delivered to the crushers. By means of the cog 

 gearing driven from the shaft to which is attached the crank or drive 

 wheel, the crushers are made to revolve inward at the desired rate of 

 speed. The spiral corrugations are so cut that they cross each other 

 at an angle which adds very materially to the crushing or pulping 

 effect of this mill. 



So far as was observed, this apparatus seems well adapted either to 

 hand or power work, and gives good results. Its most important 



Fig. 8. — "Greif ' apple crusher, sectional view of hopper. 



advantages are, (1) the pomace is not brought so much in contact 

 with metal surfaces, as is the case with grating mills; (2) it can be 

 regulated to grind line or coarse very quickly and with certaintv, and 

 (3) the operator is entirely freed from the task of removing and grind- 

 ing knives. 



It should be noted that the fruit must be carefully freed from stones, 

 sticks, and the like, or a breakdown of the working parts is sure to 

 occur. The grater mills, with spring adjusted concaves, are not 

 nearly so liable to such mishaps. 



This German mill appears to be coming into favor in England. The 

 ordinary mills of other styles presented no points of special importance. 



