Flames of Carbonic Oxide and Hydrogen, 491 



\ Rs w B.s s h )~~ ' 



h , o n _, 



— -f — + — =B, 

 $h s s n 



S, = . G p , . . (6) 



1 A# + B ' w 



If we now substitute in equation (6) the value of x found in equa- 

 tion (4), and the value of Sj in equation (5), so we have, when 



E 



where 



AD + B«Aw-BC+^ 

 «(AD-BC) 



F = 



«(AD-BC) 



The one of these values of /j is greater than that got from 

 equation (I), and has therefore no importance for this problem. 

 When the temperature of combustion t x is found, then we get 

 from equation (4) the value of hx, i. e. the quantity by weight 

 of hydrogen which was burned at the moment when the maxi- 

 mum temperature of the flame was reached ; and consequently 

 also the value of h(l —x), i. e. the quantity by weight of hydrogen 

 which had lost the power of burning at the high temperature t v 



All the numerical values are known, with the exception of Pj, 

 for mixtures of carbonic oxide or hydrogen with oxygen and ni- 

 trogen, which serve in the equations for the determination of t x 

 and x. For mixtures of gases of this composition it is therefore 

 only necessary to determine by experiment the value of P r 



The measurement of the pressure caused by an explosive mix- 

 ture at the moment of maximum temperature can be approxi- 

 mately determined when the exploding-vessel is closed air-tight 

 with a plate loaded with weights, by means of which the exact 

 weight can be observed which can still be raised by the exploding 

 gases. Such measures of pressure are only reliable within cer- 

 tain limits. For if an explosive mixture be diluted with a 



2K2 



