PAPERS ON CHEMISTRY AND PHYSICS 145 



and by attempts to lower the air supply. The study of 

 the effect of the air supply upon the efficiency resulted in 

 the stopping of the spray and the burner, of course, 

 was extinguished. The maximum carbon dioxide from 

 this type of burner was found to vary between 4 and 5 

 per cent, 4.6 being the average. These conditions can 

 probably be made more favorable by several adjust- 

 ments, but it was found impossible by the author to keep 

 the oil supply constant and change the amount of air 

 supplied to the burner. In this type of burner, the oil 

 supply, of course, depends upon the velocity of the air 

 current. 



In the studying of the vaporization type of burner, the 

 air could be controlled and the relationship of the tem- 

 perature to the quantity of air necessary for the maxi- 

 mum efficiency was easily found. Figure 1 shows the re- 

 lationship between the temperature and the percentage 

 of carbon dioxide in the flue gas. The oil supply was 

 held constant during these readings and the air supply 

 was diminished. The maximum air supply that the 

 burner could possibly use was used as a starting point 

 and the readings were taken as the air supply was di- 

 minished. As is indicated on the curve, both the per- 

 centages of carbon dioxide and the temperature were 

 found to increase to approximately 8.3% carbon dioxide. 

 After that a quick break in the curve, indicating a lower 

 temperature, shows that above this point, at least, the 

 efficiency was quickly lowered on the carbon dioxide curve 

 bet-ween 6.6 and 8.3' I . There was only a comparatively 

 small change in temperature, and this would indicate that 

 an average in this range would be perhaps the most effi- 

 cient in this condition. The conclusion from a study of 

 the flue gases of the ordinary marketed types of oil burn- 

 ers can be summed up as follows : 



1. A control of the air supply is very advantageous. 



2. The air supply should be such that the carbon di- 

 oxide in the gas should come between 6.6 and 8.3 



3. The construction of the burner should be such that 

 a r-hano-e in regulation would not affect the mechanical 

 action of the burner. 



