MANURE SPREADERS IQO, 



the center. If due provision is not made, the spreader 

 will spread heavier at the center than at the sides. One 

 beater has the teeth arranged in diagonal rows, tending 

 to carry the manure from the center to the sides. Sev- 

 eral have leveling rakes in front of the beater, and at 

 least one a vibrating rake, to level and help pulverize 

 the manure. If no provision is made, the front of the 

 beater will be filled with manure while loading, and the 



FIG. 152 A RATCHET DRIVE FOR THE APRON, NOTE METHOD OF VARYING 



THE FEED 



machine will not only be difficult to start, but will carry 

 over a heavy bunch of manure when put in motion. To 

 surmount this difficulty, the beater in some makes is 

 made to move back from the load when put in gear. A 

 few machines have an end board, which is dropped in 

 front of the beater while the load is put on, and lifted 

 when spreading is begun. 



272. Apron drives. At least two systems of apron 

 drives are in use: (a) the ratchet, and (b) the screw or 



