150 THE PRODUCTION AND USE OF HEAT 



quantity of air so that complete combustion may take place 

 quickly, producing a blue or non-luminous flame. 



There are gasoline stoves of many makes and styles. But 

 since all gasoline stoves must conform to these principles a 

 study of one will enable us to understand the others. 



175. Self-generating and Non-self-generating Gasoline 

 Stoves. When we placed the gasoline in an open vessel 

 and applied the lighted match, we found that the gasoline 

 burned readily, but that it burned with a luminous and more 

 or less smoky flame (Art. 104). To prevent this burning with a 

 luminous flame, we must completely vaporize the gasoline and 

 mix the vapor with fresh air before it reaches the flame and 

 ignites. When thus mixed with the proper amount of air 

 before being ignited, the vapor burns much more rapidly and 

 completely and the luminous and smoky effects completely 

 disappear. In Art. 105 we learned how to change the lumi- 

 nous flame into a non-luminous flame. The principle em- 

 ployed was exactly the one just described. 



All gasoline stoves must be provided with some means of 

 accomplishing this complete vaporization and mixing of the 

 vapor with air. Stoves which are automatic in their opera- 

 tion after the gasoline is first turned on and lighted are said 

 to be SELF-GENERATING; those which are not automatic in 

 their operation at first but which have to be watched and 

 attended to, as we would watch the gasoline lamp (Art. 41), 

 until the generator becomes hot enough to vaporize all of the 

 gasoline, are said to be NON-SELF-GENERATING (Fig. 115). 



176. The Non-self-generating Stove. 



Exercise 41. Lighting and Operating the Gasoline Stove 



Examine the can, or holder, for containing the gasoline. Is it 

 nearly air-tight? Is it a separate can sitting within a larger outer 

 can as shown in Fig. 115 or is it a single can attached to the FLOW 

 PIPE? Is it provided with a valve to stop the flow of gasoline? Be 

 certain that you see how the valve operates. Is there a valve on the 

 flow pipe near the burner? In the gasoline lamp we heated the small 

 flow pipe so as to produce complete vaporization by using an alcohol 



