GAS, OIL AND ALCOHOL ENGINES 



415 



FIG. 301 PENDULUM GOVERNOR 



When the liquid gasoline is converted into a vapor its 

 volume is increased about 1,500 times. To make a strong- 

 explosive mixture the vapor must be diluted from 8 to 

 13 times the volume of the air; the air in 'Jiis case supply- 

 ing the oxygen. Thus we see that the volume of gasoline to 



the volume of air used is in the 

 proportion of about I to 12,000 

 or to 19,500. It follows that the 

 carburetor must necessarily be a 

 very delicate arrangement. An 

 engine will not run satisfactorily 

 unless the mixture is very nearly 

 correct. There is a multitude 

 of surface, wick, gauze, spray, 

 atomizing and float-feed car- 



FIG. 302 PRINCIPLE OF THE , . 



a generator valves on 



