MR. W. T. DAVID ON THE RADIATION IN 



TABLE V. 



The curves in fig. 9 are the differentials of the radiation curves shown in fig. 8 

 plotted to a gas-temperature base. They show the mean rates at which radiation is 

 received by the black walls of the vessel (in calories per square centimetre per second) 

 from the maximum temperatures attained by the various mixtures after explosion 

 down to 1000 C. (abs.). These curves show that the weaker mixtures radiate much 



2600 24-00 



/60O 1400 

 TemAera/ure. - "C aiso/att 



2200 2000 tSOO 

 Gas 



fSOO 100O 



Fig. 9. 



more powerfully in the initial stages of cooling than the stronger mixtures do when 

 they have cooled to the same temperatures, although there is very much more 

 radiating gas present in the latter mixtures. Later on in the cooling the radiation 

 from all the mixtures is very much the same at the same gas temperatures. The 

 chain-dotted curve is a 0* curve, where & is the mean absolute temperature of the gas, 

 made to coincide with the radiation curves at the low temperatures. 



