1911)1 



on Liquid Oxygen in Warfare 



(107 



of the sphere was practically nil, fclic maxinniin distortion diirini,^ 

 tilting IteiuL'' about 15 . 



LIQUIJ) AIR COMPOSITIOX. 



When only liquid air mstead of liquid oxygen is available, the 

 respirable quality of the product must be considered. 



_ Liquid air as usually obtained varies in composition and boiling 

 point, roughly, between 84 per cent, oxygen and (JG percent, nitrogen 

 bodmg at SO'' Absolute, to 100 per cent, oxygen (no nitrogen) boiling 

 at 90" Absolute. 



\007. 

 60% 



OXYGEN PROPORTION in LIQUID AIR 



RELATED TO ITS 



BOILING TEMPERATURE 



Fig. 11. 



The corresponding composition of tlie vapour rising froni it will 

 be 12 per cent, oxygen and S8 per cent, nitrogen from the liquid 

 boiling at 80° Absolute, increasing up to the final pure oxygen from 

 the liquid at 90^ Absolute. This is shown in Fig. 10, in which also 

 is included the logarithmic relation between the proportion of each 

 constituent in the liquid and vapour as given by Baly,* 



log. /•' = 0'r)12 + 0-940 logr, 



when r and r' are ratios of oxygen to nitrogen in the vapour and 

 liquid respectively. Fig. U is another curve applicable to the 



* Travel's' Gases, 1901, 224. 



Vol. XXn. (No. ll:>,) 



