PLOW BOTTOMS 107 



in the northwestern section of the United States. In 

 plowing these peculiar types of soils the farmer fre- 

 quently desires to plow deep. This can be accomplished 

 with this bottom. The shape of the mouldboard is 

 curved so as to pulverize this type of soil exceptionally 

 well. 



Illustration J 



The slat mouldboard gives less surface, hence less earth sticks. For 

 this reason the slat bottom serves a good purpose. 



Illustration J shows a slat bottom. There are soils 

 so sticky by nature that the ordinary plow bottom will 

 not scour. These soils will not hold together sufficiently 

 to give enough pressure against the mouldboard for 

 scouring. The slat bottom eliminates a part of the 

 mouldboard. Therefore, there is not so much surface 

 to which the earth may stick. For this reason a slat 

 bottom will scour and do a good job of plowing where a 

 solid mouldboard entirely fails. These bottoms are also 

 exceedingly useful for plowing black, waxy and clay 

 soils in which an ordinary plow bottom fails to scour. 

 The share is made with a comparatively straight edge 

 to give a straighter cutting surface to the share. 



