388 



MR. W. T. DAVID ON Till; KA1HATION IN 



TXRLE VI. 15-per-ceut. Mixture. Half Atmosphere Initial IVssmv. 

 Heat of Combustion of Coal-gas present in Vessel = 8000 Calories. 



TABLE VII. 15-per-cent. Mixture. One-and-a-half Atmospheres Initial Pressure. 

 Heat of Combustion of Coal-gas present in Vessel = 24,190 Calories. 





The curves in fig. 11 are the differentials of the radiation curves in fig. 10. They 

 give the average rate at which the 15-per-cent. mixtures of the various densities 

 emit radiation during cooling. It will be noticed that the denser mixtures emit much 

 more radiation than the thinner mixtures, especially at the moment of maximum 

 pressure and in the initial stages of cooling. The emission, however, is not in 

 proportion to the density, but varies more nearly as the square root of the density. 







Rough Analysis of the Radiation Emitted by the Gaseous Mixture. 



The various radiation curves in fig. 12 show the radiation which is transmitted 

 through clear plates of fluorite, quartz, and plate glass, and through j in. of water 

 (contained between two plates of glass) in explosions of 15-per-cent. mixtures at 

 atmospheric initial pressure. 





