216 



Journal of the Asiatic Society of Bengal. [June, 1914. 



Volume per cent. 



Carbon Dioxide 



Oxygen 



Carbon Monoxide 



Methane 



Hydrogen 



Nitrogen (by difference) 



Oil Gas 

 0-0 



o-o 



0-2 

 48-9 



0-8 

 10-9 



Coal Gas. 



1 







8 

 34 

 49 



4 



1000 



1000 



On exploding the _ 

 volume of gas required for its complete combustion 1 '3 vol- 

 umes of air, whereas the coal gas found to be most useful for 

 domestic, industrial, and scientific purposes and for internal 

 combustion engines is one of such composition that one volume 

 of gas requires 5 to *5 volumes of air for its complete 



gas requires 

 combustion. (B 



Works 



A lec- 



ture delivered in December, 1912, before the Institute of Chem- 

 istry, London). 'Close conformity in character with such 

 a gas presents the advantage that burners and apparatus 

 applicable for use without re-adjustment or modification are 

 readily obtainable." It occurred to the author that such a 

 gas might be obtained by mixing air with oil gas in bulk in 

 the gas-holder, and in order to determine the extent to which 



of explosion the rate of 

 propagation of progressive combustion in mixtures of the gas 



measured. This was done 



this might be done without danger 



ons 



by allowing the gas mixtures to flow through tubes of known 

 area of cross-section with a velocity just sufficient to prevent 

 the tiame from travelling against the current. (Bunsen, Gaso- 

 metrische methoden 1877, p. 317: Michelsen, Zeit. phys. Ch. 3, 

 493). 



The results are shown in the following table : 



Table IE. 



Volume per cent of oil gas 



in mixture. 



5-8 

 71 



A. 7-5 



B. 8-2 



8-7 



92 

 10- 1 

 12 1 

 160 



Rate of propagation of 



combustion. 



21-5 cm per sec 



260 



28-5 



335 

 315 



30-0 

 202 



10-8 

 0-3 



99 



»? 



99 



91 



91 



>J 



11 



91 



11 



•1 



J9 



11 



91 



* » 



19 



99 



