EXPLOSIONS OF COAL-GAS AND AIR. 



i nt 



Mi.rtures of the. SHHW tif 



Kxperiments of the same kind wen- then made with 1 5-per-cent. mixtures at 

 \ ;n i<>us densities. The results of these experiments have been collected into fig. 10. 

 Tlit- radiation curves in this figure are the means of those taken with the bolometer 

 in positions A, B, and C on the end cover. Curves I. refer to 1 5-per-cent. mixtures 

 at one-and-a-half atmospheres density and Curves III. to 15-per-cent. mixtures at 

 half an atmosphere density. Curves II. in the same figure, referring to 15-per-ceut. 

 mixtures at atmospheric density, are the same as Curves I. in fig. 8, and are included 

 in this figure for purposes of comparison. 



1600 



SOO 



100 0-2 







3 -4 -5 -6 



Time offer fynifcon - seconds. 

 Fig. 10. 



Tables VI. aud VII. have been prepared from Curves I. and III. in this figure ; for 

 Curves II., see Table III., p. 385. 



It will be noted that the denser mixtures emit a rather smaller proportion of their 

 heat of combustion up to the moment of maximum pressure than the thinner 

 mixtures do; this is so because the denser mixtures have a slightly greater opacity 

 than the thinner mixtures. In comparing the loss of heat by radiation during 

 cooling it is to be remembered that the rate of cooling of the thinner mixtures is 

 greater than that of the denser mixtures; had the rate of cooling of the mixtures 

 been the same the thinner mixtures would have radiated off a far larger proportion of 

 their heat of combustion than the denser mixtures. 



3 D 2 



