PLOW BOTTOMS 



109 



a feature which is absolutely necessary in the types of 

 soil to which this bottom is adapted. The shape of the 

 share and mouldboard is such that the earth exerts an 

 even pressure upon the bottom from the time the share 

 strikes it until it is turned over on the furrow side. 



Illustration L 



Illustration L depicts a bottom popularly known as a 

 Scotch type and is for use in turning soils in those 

 countries where clay land predominates and where rain- 

 fall is excessive. The share is narrower than the mould - 



The work of the plow bottom shown in illustration L reveals that the 

 earth is turned over with little or no pulverizing. This is necessary for 

 underdraining and to give the furrow slice on top an opportunity to dry 

 out so that it can be successfully tilled. 



