GAS AND OIL ENGINES 



"Having now the means to rapidly heat the air, the 

 outlook for the external-combustion engine is certainly 

 very promising. 



"The saving of more than half the coal now used by 

 the steam engine will be of tremendous importance to 

 the whole world." 



To what extent this optimistic prediction will be veri- 

 fied is a problem for the future to decide. 



