152 PROFESSOR H. B. DIXON ON THE RATE OF EXPLOSION IN GASES. 
Table XXXTX.—Pressures in the Explosion-wave calculated from Riemaxx’s 
Theory. 
Explosive Mixture. 
Calculated Pressure. 
n 
n 
T2 
Effective Pressure 
measured byBERTHELOT. 
CoNo 4 - Go 
135-2 
32-2 
25‘11 
CoNo + 2NO 
1230 
29-3 
23-34 
C.,N„ + 2N.,0 
121 -G 
28-9 
2G-02 
C„N.. + 20., 
901 
21-5 
20-96 
C0N2+O3 + 2 N 3 
71-0 
lG-9 
15-25 
C[>Hj-l- O3 
81-5 
0.3 
94-3 
88-4 
CoHi + Ofi 
75-2 
17-9 
16-13 
CH, + 0, 
62-2 
14-8 
16-34 
CoH„-f Oj 
110-0 
CoHo-OOg 
94-5 
CjHo -|- Og -|- N30 
45-3 
Hg + O 
28-8 
G-9 
7-05 
h!+o 
41-3 
9-8 
9-8 
H., + 0 + N, 
31-G 
7-5 
7-41 
Ho + NoO 
to 
12-G 
13-6 
1 
CO + 0 
35-7 
8-5 
10-1 
Bv Le Chatelier. 
H + Cl 
4G-9 
11-2 
10-0 
It is to be noticed that these calculated pressures are in substantial agreement 
with my experiments on the fracturing of glass tubes by the explosion of carbonic 
oxide and of cyanogen with oxygen ; and also that the minimum jaressures calculated 
for the diluted electrolytic gas are close to 30 atmospheres—the pressure required to 
fire electrolytic gas by the heat of compression. 
Note by Professor Arthur Schuster, F.R.S. 
In 1859 Riemahn* deduced an equation for the propagation of abrupt variations in the density and 
pressure of a gas, on the supposition that such an abrupt variation could be propagated without change 
of type. Lord RAYLEiGHf criticising this investigation, draws attention to the fact that a steady wave 
* ‘ Gottingen Abhandlungen,’ vol. 8 (1860). 
t Rayleigh, ‘ Sound,’ vol. 2, ]). 41. 
