192 Prof. W. M. Thornton on the Limits of 



The normal ignition of benzene * is to CO. This is also true 

 for cyanogen f and probably for ethylene J. The critical 

 mixture for acetylene § is 



2C 2 H 2 + 3 = C 2 H 2 + 2CO + H 2 0, 



u 



75 

 70 

 65 

 60 

 55 

 50 

 45 

 40 

 35 

 30 

 25 

 20 

 15 

 10 

 2 





H 

































CO 































































































1 \ 































4 c 



2 H 2 





























I u 



































i C 2 N 



I 































1\ 

































































V 



• \ 





























H^ 





^ 































CH^ 









£? H « 





























S H s 



»<T- 



-- 



^ 



£^]6 



£3H 



3^ 





£& H t 



3 C 



5H !2 



































3 

 OX x < 



4 5 6 7 8 9 10 II 12 13 . 14 I! 



r/V ATOMS FOR NORMAL COMBUSTION- 



16 



th9 mixture for complete combustion being passed through 

 without any change of inflammability. The same would 

 appear to be the case for carbon disulphide, and in both of 

 these the ratio of oxygen to combustible gas burnt to CO 

 is 3/2. 



2. The empirical equations in column 5 represent the 

 nearest whole number mixtures to give the observed upper 

 limit. The values calculated from these are given in the 

 last column. As an example of the use of the empirical 



* " The Electrical Ignition of Gaseous Mixtures/' Proc. Roy. Soc. A. 

 vol. xc. p.281 (1914). 



f " Ignition by Impulsive Discharge/' /. c. p. 396. 

 \ "Ignition by Impulsive Discharge," I. c. p. 393. 

 § " Ignition by Impulsive Discharge," I. c. p, 394. 



