I A PLOSIONS OF COAL-GAS AND AIR. 



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TABLK Til. 15-per-cent. Mixtures (Second Set). Initial Pressure, Atmospheric. 

 Heat of Combustion of Coal-gas present in Vessel = 16,400 Calories. 



TABLE IV. 13-per-cent. Mixtures. Initial Pressure, Atmospheric. 

 Heat of Combustion of Coal-gas present in Vessel = 14,230 Calories. 







After 1 second from ignition the radiation emitted is very little. At this time 

 each mixture has radiated about the same proportion, viz., 25 per cent., of its heat of 

 combustion. 



The amount of heat lost by radiation up to the moment of maximum temperature 

 is roughly proportional to the product of the third power of the maximum tem- 

 perature (absolute) attained into the " time of explosion." This will be seen from the 

 following table, where Ii m is the radiation absorbed by the blackened wall per square 

 centimetre up to the moment of maximum temperature, 6 m the maximum temperature 

 (absolute) attained in the explosions, and t the "time of explosion." 



VOL. ccxr. A. 3 D 



