WORKING THE SOIL 139 



will keep to the furrow on level ground a distance of 

 several feet without guidance from the handles. In 

 making the adjustment it is first necessary to see that 



Figure 134. Disk Plow. Less power is required to plow with a 

 disk, but it is a sort of cut and cover process. The disk digs 

 trenches narrow at the bottom. There are ridges between the little 

 trenches that are not worked. 



Figure 135. Three-Horse and Four-Horse Eveners. This kind of 

 evener hitches the horses closer to the load than some others and 

 they are easier to handle than the spread out kinds. The four- 

 horse rig requires the best horses in the middle. 



the plow itself is in good working order. All cutting 

 edges such as share, coulter or jointer must be reason- 

 ably sharp and the land slip in condition as the makers 

 intended. 



