108 PROFESSOR H. B. DIXOX ON THE RATE OF EXPLOSION IN GASES. 
In the following table some of these results are shown :— 
Table VII.—Pressure Experiments. 
R, + N3O. 
Pressure. 
500 mm. 
760 mm. 
1000 mm. 
Mean rate 
2094 
2307 
2302 
CH, + 0,. 
Pressure. 
500 mm. 
760 mm. 
1000 mm. 
IMean rate 
2280 
2322 
2319 
CH 4 , + Og. 
Pressure. 
500 mm. 
760 mm. 
1000 mm. 
Mean rate 
2418 
2470 
2488 
C0N3 -f 0. (in 
5 mm. tube). 
Pressure. 
500 mm. 
760 mm. 
1000 mm. 
]\Iean rate 
2536 
2677 
2671 
§ 5. Influence of I'emperature on the Velocity of the Explosion-Wave. 
Berthelot has published no experiments on the influence of initial temperature 
on the explosion-wave ; but, if the wmve is propagated in a manner analogous to a 
sound wave, it might be anticipated that an increase in the initial temperature of the 
gases would increase the velocity. The reverse effect is found in the explosion of 
hydrogen and oxygen. Experiments made at 10° C. and 100° C. showed a small, but 
distinct, lowering of the rate at the higher temperature. The experiments were 
made alternatel}^ at the high and low temperature, in order to eliminate the effect 
which might be produced by any mistake in the mixture or error in the chronograph. 
The comparative experiments made at 10° agreed with those previously obtained 
