PROFESSOR H. B. DIXON ON THE RATE OF EXPLOSION IN GASES. 
109 
under tlie same conditions, so that the results found at 100 ° must be accepted.* A 
similar lowerinsf of the rate at 100 ° was found to occur at low and high pressures. 
Table VIII. 
Temperature Experiments. + 0. 
Temperature. 
10 °. 
100 °. 
l\Ieau rate 
2821 
2790 
Hj + 0 at 100 ° C. at different pressures. 
Pressure. 
390 mm. 
500 mm. 
760 mm. 
1000 mm. 
1450 mm. 
Mean rate 
2697 
2738 
2790 
2828 
2842 
When the rates at 100 ° and varying pressures are compared graphically with the 
rates found at 10 ° and varying pressures, it is seen that the two curves run parallel 
one with the other (see fig. 1 on Plate 1 ). 
The explosion-rates of ethylene and oxygen at 10 ° C. and 100 ° C. were also com¬ 
pared. Samples of the same mixture were exploded alternately at the low and at the 
high temperature. Five concordant determinations at 10 ° C. gave a mean velocity 
of 2581 metres per second; four concordant determinations at 100 ° C. gave a mean 
velocity of 2538 metres per second. Similar experiments were made with cyanogen. 
Table IX. 
Rate of Explosion of Ethylene and Oxygen. + 2 O 3 . 
Temperature. 
10° C. 
100° C. 
Mean rate 
2581 
2538 
Rate of Explosion of Cyanogen and Oxygen. C^No + Oo. 
Temperature. 
10 ° C. 
100° C. 
Mean rate 
2728 
2711 
* The expausion of the metal tube is taken into account in calculating the rates at lOU” C. 
