174 THE OLIVER PLOW BOOK 



If the plow has no front wheel, it is equally obvious that 

 the bottom will go deeper in order to straighten the 

 draft line. 



If a wheel plow is working in ground that is hard to 

 plow this trouble may not be noticed, but the instant it 

 strikes easy ground the trouble will become plain im- 

 mediately. 



Another way for the operator to determine whether 

 or not this point of draft is correct is to raise the front 

 furrow wheel and also the landside wheel if they are 

 both well to the front of the plow. The plow will im- 

 mediately begin to penetrate deeper and deeper if the 

 line of draft is not straight at the depth desired to plow. 



If the plow is a gang, this condition will cause the 

 front bottom to penetrate deeper than the rear bottoms. 

 This naturally then requires lowering the hitch at K to 

 the point G on the vertical clevis. 



Side draft would not take place if the line of draft 

 could be operated parallel to the furrow wall. The 

 principle back of adjusting the side pull is identically the 

 same as that of adjusting the vertical pull with the 

 exception that it operates in a horizontal plane. If this 

 be true, the question of why cannot this line of draft be 

 operated at an angle as successfully as the vertical draft 

 at once arises. The answer lies in the construction of 

 the bottom. The suck and wing of the share are made 

 to permit this vertical angle pull, while it is impossible 

 to construct a device that will turn all the earth to one 

 side and have enough resistance to keep the plow oper- 

 ating parallel to the furrow wall, particularly when 

 the side pull has a tendency to draw the rear of the 

 landside away from the furrow wall. 



