GENERATING MECHANICAL POWER 



99 



virtues of farm tractors, and they enumerate many 

 light jobs, such as running a cream-separator, sawing 

 wood, pumping water and turning the fanning-milL 

 Well, a farm tractor can do such work yes. So can 

 an elephant push a bkby carriage. If manufacturers 



Figure 114. Straight Transmission Gear, forward and chain drive 

 reverse, for traction engine. 



would devise a practical means of using electricity as 

 an intermediary, and explain to farmers how a day's 

 energy may be stored in practical working batteries to 

 be paid out in a week, then we could understand why 

 we should run a 20 horsepower engine to operate a 

 cream-separator one hour at night and another hour in 

 the morning. 



