SUITl F.MF.NT. 



SCIENCE AND ART OF AGRICULTURE. 



13 2i 



upper pair of crushers are driven by the wheel G. working into a wheel, 7, in the upper crush or spindle. 

 The crushing rollers are set to or from each other as the nature of the work may require. When the 

 bones are large, the upper pair of crushers only are used in passing the bones the hrst time through, an 

 inclined board being placed to prevent them from falling into the lower set ; this board is removed at 

 the second time of grinding, and the bones pass through the two sets and fall into the revolving circular 

 screen 16 : any bones that will not pass through the mesh 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. 



1166 1 



On the shaft 2 is a bevel wheel, 8, of 46 cogs (twenty-one inches diameter), driving the pinion 9, of 16 

 cogs (nine inches diameter), on an inclined shaft leading to the floor above ; on th- upper end ol 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 k is thrown out of geer by the lifting 

 screw 12 : the pinion on the flour mill spindle is raised above the spur wheel g by the screw 13. 



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

 sere* 14. 



