Radiation emitted in Gaseous Explosions. 71 



inflexion, which, of course, takes place immediately after the 

 period during which the rate of rise of gas pressure or 

 temperature is a maximum. 



■2 -25 



Time- seconc/s 



A curves : 10"5 % mixture of coal-gas and air at atmospheric density. 



B curves : 10*2 % mixture of coal-gas and air at 1*24 atmospheres density. 



C curves : 9*2 % mixture of coal-gas and air at 1-37 atmospheres density. 



7. It occurred to the writer, therefore, to make an attempt 

 to connect the maximum rate of emission (R max .) with the 

 maximum rate of rise of pressure (p max .) or of temperature 

 (^mai.), and it was discovered that for mixtures containing 

 the same quantity (Q) of coal-gas R max . was proportional 

 to the square root of <9 max .. This will be seen on comparing 

 columns 1 and 9 in Table I. It will be noticed that the ratio 



-^ max. . . ,, 



y-u is practically the same in all cases where Q has the 



V #max. 



same value. Farther, this ratio increases as Q increases and 

 it seems to be very approximately proportional to the square 

 root of Q. The figures in column 10 are the ratios of the 

 figures in column 9 to \/Q— i. e. they are the ratio 



a/Qxv/0 



