80 



POWER AND THE PLOW 



The other method of governing is that of taking and ex- 

 ploding a charge at each cycle, the amount taken in varying 

 with the requirements of the load as in the throttle-governed 

 steam engine. This method is used on practically all of the 

 high-speed engines and some of the low and medium speed 

 types. It is capable of very close regulation and is more 

 sensitive than the hit-and-miss to the requirements of irregular 

 loads. Many tractors are equipped with devices for changing 

 the speed of the engine while in motion by controlling the 

 governor. 



CARBURETER 



The object of the carbureter is to mix fuel and air in the 

 proper proportions to form an explosive mixture. If the gover- 



Fuel Chamber 



Principle of the carbureter 



