Gascons Explosions. c 



excess of oxygen, the carbonic oxide is liable to get. 

 burnt, and therefore should be considered as a portion of the 

 detonating gas left unburnt. When there is a deficiency of 

 oxygen, the carbonic oxide may be classed with the excess 

 of hydrogen left over, and whether it affects the amount of 

 unburnt detonating gas depends upon the quantity of 

 oxygen remaining. 



To determine the influence of the amount of surface 

 exposed to the gases, a tube 4 mm. in diameter was next 

 employed. The length was about 170 metres, and the 

 internal surface 25,000 sq. cm. the capacity being 2,750 cc. 

 The method of procedure was the same as before. Under 

 A, in the following table, is given the mean of several 

 analyses of residues from mixtures containing an excess of 

 hydrogen, and under B, the mean result from mixtures 

 containing an excess of oxygen. 



CO 

 O2 



N2 



Average Residue 



% of original detonating gas unburnt : — 



Max 1-34 2-27 



Min -84 1-55 



Mean 109 ipi 



The % unburnt, under A, does not differ much from that 

 obtained with the wider tube. Under B we see a rather 

 larger percentage. In the next tables are given the means 

 •of analyses of residues obtained with a tube 19 mm. in 



