450 



Effective Farming 



FIG. 200. Cutaway disc harrow. 



must be governed largely by the character of work to be done 

 and the type of soil on the farm. 



Disc harrows. As shown in Fig. 199, disc harrows are a 

 series of round sharp discs .mounted on a frame. When the 

 harrow is propelled, these discs revolve and cut into the soil. 

 They can be adjusted to cut at an angle or straight ahead. The 



1 



FIG. 201. Spring- tooth harrow. 



