SUPPLEMENT. 



1279 



through the two sets and fall into the revolving circular screen 16 : any bones that wUi 

 not pass through the mash of the screen are again put into the mill. The screen is set in 

 motion by the wheel 6 working into a pinion, not shown in the drawing, and by a shaft 

 and universal joint connecting with the axis of the screen. 



On the shaft 2 is a bevel wheel 8 of 46 cogs (21 inches diameter), driving the pinion 

 9 of 1 9 cogs (nine inches diameter), on an inclined shaft leading to the floor above ; o^ 

 the upper end of this shaft is a bevel wheel 10 of 52 cogs (twenty inches diameter), 

 driving a pinion 11 of 17 cogs (nine inches diameter,) on the spindle of the chaff-cutting 

 machine. 



When the threshing machine only is at work, the mitre wheel h is thrown out of geer by 

 the lifting screw 1 2 ; the pinion on the flour mill spindle is raised above the spur wheel 

 g by the screw 1 3. 



When the threshing machine is not at work, the mitre wheel i is thrown out of geer by 

 the lifting screw 14. 



The pinion 3 is kept in its place on the shaft 2 by a key ; when the bone-mill is not at 

 work, the pinion is slided along the shaft clear of the wheel 4. 

 ^ There are three cogs dovetailed into the pinion 9 ; when the chaff-cutting machine is 



