HOW TO STUDY FARM MACHINERY 281 



merit. A careful knowledge of such equipment is neces- 

 sary for its efficient use. 



Working Instruction: Same as in Sec. 251 . 

 257. Study of Gas Engines, Tractors and Trucks. 



Requirements: To become thoroly familiar with at least one 

 type of gas engines, one type of tractors and one type of 

 trucks. 



Preliminary Instruction: There is more power used on the 

 farm than in all other industries combined. The total 

 horse power has been estimated to be more than 25,000,- 

 000. More than one-half of this is mechanical power. 

 Altho the farmer is one of the greatest power users, it is 

 only within recent years that he has paid any attention 

 to this phase of his farm problem. Every farmer should 

 become familiar with the construction of an internal- 

 combustion engine. 



Working Instruction: Follow instruction as outlined in Sec. 

 251. Pay especial attention when studying a stationary 

 engine to its general construction, the ignition system, 

 system of carburation, method of cooling, oiling devices, 

 type of governor, and determine for what type of work 

 the engine is best suited. In addition, for tractors and 

 trucks, note how the power goes from engine to drive 

 wheels, the clutch, transmission, differential and drive 

 shaft and observe the lever control. Note the wheel 

 construction, fenders for protection, seat, arrangement of 

 fuel tanks, etc. 



