﻿Ignition of Gases by Sudden Compression, 



Table IX. 



( 1 alculation of cooling- factor corresponding to C 2 . 



107 



Time from 

 maximum 

 pressure. 



Observed 

 pressure. 



P-P r 



, ■*• max. — •*- f j 



•=2-8 a/*. 



00 



116-2 



44-9 













0-232 sec. 



111-7 



406 



•044 





•44 



•465 ., 



107-3 



36-0 



•096 





•47 



•70 „ 



103- > 



323 



•143 





•47 



•93 „ 



1006 



29-3 



•185 





•46 



1-16 „ 



96-9 



256 



•244 





•48 



1-39 „ 



94-7 



23-4 



•283 





•47 



1-63 „ 



92-5 



21-2 



•326 





•46 



i 



p / 



=4-83x14 



77=71-3. 





Mear 



= 0-47 







Table X. 



Ignition of mixtures of ether and air. Fan full speed. 



Initial pressure (atmospheric) = 14*77 lb. /sq. in. 

 Mean apparent value of y=1'308. 

 Strength of mixture as in Table VIII. 



No. of 



Compn. 



Initial 



Max. Couip. 



Max. temp, 

 calc. from 



Delay 



Cooling 

 factor 



expt. 



ratio. 



temp. 



pressure. 



y = 1'308. 



obs. 



=«. 



Di 



5-42 



24° C. 



135 



226-5° C. 



No. ign. 



1-33 



D 2 



573 



24 



146-5 



235 





1-28 



D 3 



6-03 



24 



155-5 



243 5 



o-io 



— 



vl 



633 



24 



164 



251 



047 





D 5 



6-63 



24 



174 



259 



0-038 



— 



Dc 



7-02 



24 



186 



268-5 



0-026 





Dt 



5-82 



22 



149 



235 



No. igu. 



1-25 



D fl 



5-94 



22 



150-5 



238 



013 



— 



D g 



6-03 



22 



155 



240 



0-087 



_ 



Dio 



6-13 



22 



161 



243 



0-078 



— 













Mean 



=1-29 



namely a =0*47. Table XI. shows the details of the cal- 

 culations for D 2 ; it will be noticed that the cooling factor 

 appears to diminish fairly steadily as the time increases. 

 T>i and D 7 showed a similar effect : in each case the mean 

 has been taken, and the mean value for the three experi- 

 ments, namely a = 1'29, is probably fairly accurate. The 



