Manchester Memoirs, Vol. xlii. (1898), No. 7. 



VII. On the Instantaneous Pressures produced on 

 the Collision of Two Explosion Waves. 



By R. H. Jones, B.Sc, 



AND 



J. Bower, B.Sc. 



[Communicatad by Professor H. B. Dixon, F.R.S.] 



Received and read February 8th, i8g8. 



A paper, the latter portion of which treated upon this 

 subject, was brought before the Society in 1894 by Dixon 

 and Cain ; but, owing to knowledge attained since that 

 time by the former investigator in conjunction with our- 

 selves, some doubt has been thrown on the significance of 

 the numbers then obtained. 



At a recent meeting of the Society, Professor Dixon 

 brought before your notice several photographs taken in 

 order to gain information concerning the " Nature of 

 Flame in Explosion." Among the photographs were 

 several shewing that the effect of a junction in the 

 apparatus is to check the rate of explosion and to diminish 

 the luminosity very materially, the explosion wave only 

 recouping itself after traversing the explosion tube for some 

 six or eight inches beyond the junction. 



This we discovered by photographing the flash on a 

 sensitive film fastened to a rapidly-revolving wheel. 



The apparatus consists essentially of a flat-rimmed 



-^ J3th, i8g8. 



