122 THE OLIVER PLOW BOOK 



A type of mouldboard which breads this wet clay soil into large clods. 

 Notice the bluffness and the effect upon this soil. It ought not require 

 any argument to show that this plow is not adapted to this type of soil. 

 Breaking soil into clods is not plowing. 



the share and shin cuts away the earth, leaving the land- 

 side free from coming in contact with the furrow wall. 

 However, in actual practice this condition does not pre- 

 vail. 



It has been found that the pressure of the landside 

 against the furrow bank caused by incorrect hitching 

 increases the total draft of a plow bottom from fifteen to 

 forty per cent., depending upon the kind of soil being 

 plowed and the distance the hitch is away from the 

 center line of draft. 



This statement with reference to the pressure of the 

 landside immediately suggests the point, why have a 

 landside on a plow if there should be no pressure against 

 the furrow bank ? There must be some means for keep- 

 ing the plow from swerving to one side whenever the 

 share strikes some obstruction that causes a sudden 

 shifting in the center of draft of the plow bottom. For 



