120 



THE OLIVER PLOW BOOK 



The furrow slice is being picked up and turned over very much as a 

 cal^e of ice, without any perceptible pulverization of the ground. Observe 

 that the bottom of the furrow slice does not rest against the furrow bottom 

 except the loose particles that have broken off and have fallen down. 

 Observe the center of draft on this plow is lower than the one shown on 

 page 118. 



the share will give the amount of work done by the 

 mouldboard. Using the entire plow without cutting the 

 furrow wall gives the amount of work required by the 

 shin to cut the furrow wall, the share, the sole, and the 

 mouldboard to crush and invert the furrow. Experi- 

 ments of this kind have been conducted with widely 

 diversified results. 



A test was made using what is known as the Scotch 

 type of plow bottom. The ground, clay sod, was being 

 plowed six and one-half inches deep and eleven inches 

 wide. The amount of work done by the share was forty 

 per cent, of the total, the lifting and placing by the 

 mouldboard, forty per cent, and cutting the furrow wall 

 by the shin twenty per cent. 



