CHAPTER XXI 



Adjusting Horse Plows 



A WALK ING plow is the simplest form of plows. 

 It does the best of work when properly hitched 

 and causes the operator the utmost grief if the draft 

 line between the horses and the plow is incorrect. 



The law that applies to the draft of tractor plows is 

 the same for walking plows, but the application is radical- 

 ly different because the center of power upon horse drawn 

 plows is the point equal in height to the average point 

 on the shoulders where the tugs are fastened to the hames 

 and midway between the outside horses. The draft line 

 between the center of draft of the plow and this point 

 will always straighten. The center of draft of either 

 a walking or wheel plow is exactly the same as 

 that on the tractor plow discussed in the third paragraph 

 in the chapter "The Tractor Plow Hitch." 



Because this draft line straightens, the depth adjust- 

 ments can be made with the clevis on the front beam. 

 Whenever it is desired to cut deeper the clevis is raised 

 and when it is desired to plow shallow the clevis is 

 always lowered. If it is desired on a right-hand plow to 

 take more land the clevis is placed to the right, and to 

 the left to take less land. Of course, these two adjust- 

 ments are opposite if a left-hand plow is being used. 



All these adjustments are made to keep that draft 

 line straight at the depth and width desired to plow. 



