﻿Ignition of Gases by Sudden Compression. 109 



The lower curve in fig. 10 is the theoretical curve derived 

 in this way ; the experimental points are shown by crosses. 



In the series of experiments with the fan running at full 

 speed, "a" = 1*29, and the new ignition temperature T</ is 

 approximately 235° 0.= 508 abs. 



Fig-. 10. 

















Ethyl 



ether 



and air. 









V* 













Nfcf^ 















^Nfci *~~ 









2e*pts.) 















-f- 

























1 











No ianitior 





and 



2 03 04 5 



Seconds delay. 



Hence .( W) = 1-29 x (*«) =0-54, 



Qo'_ 1-29 (235-23) _ 



Qo "0-47(212-23) °* 



., b 



Hence if fit =11, T ' should be given by 

 log3-08 = 0-489 = ll(l-|j-,), 

 or ^=0-956; .-. T ' = 507-5 (abs.), 



which is evidently very close to the observed value. 

 Taking this value for T ', we have 



b in 485 1/w , 

 T7 = 11X 507-5 =1 ° ,D - 



