272 



Mr. Dugald Clerk 



[Jan. 20, 



evident from numerous experiments that the velocity of the spread of 

 flame is independent of the initial density. 



T1ME.?ECS. 



Fig. 2. — Explosion Curves of Gas and Air Mixture containing 

 9 • 5 per cent of coal gas at varying initial pressures between 

 7 and 45 lbs. per sq. in. absolute. (Bairstow and Alexander). 



Explosion in a Closed Vessel. 



(Bairstow and Alexander). 



per sq. in. absolute. 



Initial pressure varied from 7*06 lbs. to 44*7 lbs 



Initial temperature . . atmospberic. 



Mixture containing 9-5 per cent gas and 90*5 per cent air 



The time of explosion not only varies with the proportion of 

 inflammable gas or vapour in the mixture and with the dimensions of 

 the explosion vessel, but it is also affected by the initial temperature 



