GENERATING MECHANICAL POWER 



87 



The old threshing horsepower has been superseded 

 by steam engines and gasoline and kerosene power, but 

 horses are more important than ever. 



Farm horses are larger and more powerful ; they are 

 better kept, better trained, and hitched to better ma- 

 chinery, because it pays. One man drives three 1,600,- 

 pound draft horses as fast as he used to drive two 



Figure 109. Horse Power, showing the manner of attaching the 

 braced lever to the bull wheel. 



1,000-pound general-purpose horses. The three draft- 

 ers make play of a heavy load, while the two light 

 horses worry themselves poor and accomplish little. 

 Modern farm machinery is heavier, it cuts wider and 

 digs deeper and does more thorough work. Modern 

 farm requirements go scientifically into the proper cul- 

 tivation and preparation of soil to increase fertility. 

 Old methods used up fertility until the land refused 

 to produce profitably. 



