CHAP. VIII. 



STRAW-TRUSSER. 



769 



another portion of the top shoe c. These materials, together with what 

 has passed through the breastwork or concave, then pass from the top 



shoe over a series of riddles. The first of these riddles is the caving 

 riddle d, which separates the cavings and the coarse chaff from the grain, 

 and allows these to travel over the front end of the riddle as shown at c, 



3D 



