80 



Major W. T. David on the Calculation of 



Total Radiation emitted during Explosion and 

 Subsequent Cooling. 



(a) Cylindrical Vessel 30 cm. diameter and 30 cm, long ; 

 Gaseous Mixtures at Atmospheric Density. 



21. In fig. 5 are given mean gas temperature curves and 

 total radiation curves per sq. cm. of wall surface for mixtures 

 of coal-gas and air of atmospheric density varying in strength 

 from 9*7 per cent, to 15 per cent. The radiation curves were 

 all taken when the bolometer was in position C, in which 



Fig. 5. 



•4 -5 



Tj'me — S"cor>cfs. 



A 



curves : 



15 



B 



curves : 



15 



C 



curves : 



1.3 



D 



curves : 



10 



% mixture of coal-gas and air. 



% mixture „ „ (taken at a later date when 



the cal. value of the coal-gas had probably altered). 

 % mixture of coal-gas and air. 

 10-2 % mixture „ „ 



E curves: 100 % mixture „ „ 



F curves : 9*8 % mixture „ „ 



position the radiation measured was very approximately 

 5 per cent, greater than the mean of that measured in 

 positions A, B, & 0. The curves cover a period of one second 

 after ignition, after which time the radiation from the 

 gaseous mixture is very small. 



