in Explosions of Coal-gas and Air. 323 



these curves. They give the proportion of the heat of com- 

 bustion of the coal-gas in the vessel which has been lost by 

 conduction at various times after ignition. 



Table IT. — Heat-loss by Conduction in a 15 per cent. 

 ♦ mixture of Coal-gas and Air. 

 Heat of Combustion of Coal-gas in Vessel = 16,300 calories. 









Heat lost by Con- 



Time 



Mean 



Heat lost by Con- 



duction expressed as a 



after 



Gas 



duction per sq. cm. 



percentage of tbe 



Ignition 



Temp. 



of Wall-surface. 



Heat of Combustion 



(sees.). 



(° C. abs.). 



(Calories.) 



of the Coal-gas in 



Vessel. 



005 



2440 

 (max.temp.) 



019 



5-1 



01 



22-20 



0-54 



14-4 



fO-15 



2020 



0-76 



20-3 



0-2 



1840 



C-92 



24-5 



0-25 



1710 



104 



27-7 



03 



1600 



113 



30-0 



04 



1430 



1-29 



34-4 



0o 



1300 



Ml 



37-6 



Table III. — Heat-loss by Conduction in a 12*4 per cent, 

 mixture o£ Coal-gas and Air. 



Heat of Combustion of Coal-gas in Vessel = 13,500 calories. 



Time 



Mean 



Heat lost by Con- 



after 



Gas 



duction per sq. cm 



Ignition 



Temp. 



of Wall -surf ace. 



(sees.). 



! (° C. abs.). 



(Calories.) 



0-08 



2050 

 (max.temp.) 



017 



01 



2030 



021 



0-15 



1920 



038 



0-2 



1800 



053 



025 



1700 



067 



0-3 



1610 



77 



0-4 



1460 



093 



0-5 



1330 



105 



Heat lost by Con- 

 duction expressed as a 



percentage of tbe 

 I Heat of Combustion 

 i of the Coal-gas in 

 Vessel. 



6-8 

 12 5 

 174 

 21-7 

 25-0 

 302 

 340 



