Radiation emitted in Gaseous Explosions. 77 



The dotted curves relate to 15 per cent, mixtures at 

 -J atmosphere, j atmosphere, and 1£ atmospheres density, 

 and they have been drawn from similar data. 



It is not suggested that these curves give a very accurate 

 relationship between Ri ma x. an d cylinder dimensions, but it 

 is considered that they give a very definite indication of the 

 shape of the true curves. 



13. These curves (with the exception of that for -J atmo- 

 sphere density) indicate that R; max . (and therefore R m ax.) 

 varies more or less as »Jl, The curve for i atmosphere 

 density is practically a straight line up to Z = 30. This seems 

 reasonable in view of the known higher transparency of the 

 gaseous mixture at this density. 



Assuming the relationship H max . a: v/ to be reasonably 

 near the truth, equations (1) and (2) may be amended to 

 cover varying volume in the following way : — 



= 0-01 y-^Qx^. 



Umax. 



r, 



= O-OO183vZxQx0ni«.. ... (5) 

 And equations (2), (3), and (4) will become — 



R max = 0-00812 ^**^£i5~, ... (6) 



% max =0-00214 \/lxQ x'C ... (7) 



R. max =0-0095 ^ * Q *^ . . . . (8) 



14. These equations it is thought may be expected to give 

 values for li ma x, and R; max . correct to within perhaps 10 

 per cent, when applied to mixtures of coal-gas and air 

 ringing from 9 to 15 per cent., within the limits of density 

 | atmosphere to perhaps H or 2 atmospheres and within 

 the limits of cylinder dimensions 15 cm. x 15 cm. to 

 60 cm. x 60 cm. 



Further experimental work wall be required in order to 

 decide whether they apply approximately outside these 

 limits. 



