Gaseous Explosions. y 



Carbonic Oxide and Oxygen. 



I. II. 



C = 8, loo cc. C = 3,075 



d=g mm. d= 100 mm. 



S = 29,000 sq. cm. S = 1,600 sq. cm. 



Average residue 205 cc. 55 cc. 



Mean composition of residue : — 



CO 26-0 41-4 



H, 17 67 



Oi 302 27-1 



N2 42-1 24-8 



lOO'O loo-o 



°/^ unburn! : — 



ro6 Max. i"i7 



Min. I -or 



Mean rog 



In this case, therefore, we have also about 1% of the 

 original detonating gas left unburnt. The surface here 

 does not appear to have much influence, the percentages 

 unburnt being almost the same, although the surface 

 exposed to the gases was, with the tube, about 3^ sq. cm. 

 for each i cc. of gas burnt, against "5 sq. cm. per i cc. of gas 

 burnt with the bomb. 



The fact that the incompleteness of combustion is char- 

 acteristic of the explosive wave, and is not observed in the 

 ordinary combustion in a Eudiometer, has an important 

 bearing on the theory proposed by Berthelot, to explain the 

 mode of propagation of the explosive wave, and also seems 

 to confirm the observation made by Mallard and Le Chate- 

 lier, that the rate of cooling in this method of combustion is 

 much more rapid than in the ordinary combustion. 



