414 



Bulletin 92 



level. Some selected boiling range curves are exhibited in figures 2 

 to 6. 



In Fig. 2 are shown the boiling ranges of three gasolines. No 

 1 curve is for an aviation gasoline; No, 2 is for a sample from the 

 yard of the Standard Oil Co. at Tucson ; and No. 3 is for gasoline 

 from the Texas Oil Company's yard at Tucson. Commercial gasoline 

 has a boiling range of from 100° to 400° F., and about 50 percent is 

 distilled at a temperature of 250° F. 



Tests of three samples of gas oil or tops are shown in Fig. 3. 

 No. 1 is high-grade gas oil, excellent for farm pumping plants and 



10 



20 



30 



40 60 60 



PERCENT DISTILLED 



70 



80 



90 



Fig. 2. The boiling ranges of three gasolines, one an aviation gasoline and the others 

 commercial gasolines in use principallj' as automobile fuel. 



usable for low-speed tractors ; No. 2 is a low-grade tops which would 

 be usable in large stationary engines that are in good condition ; No. 3 

 is too low in volatility, and was found to be unfit for continuous serv- 

 ice, even in large engines that were specially designed to burn tops. 



No. 1 and No. 2 of Fig. 3 are shown as dotted lines in Fig. 4 

 as a background for three curves showing the boiling ranges of 

 kerosenes. The Union kerosene is seen to be equivalent to a fair 



