664 
MR. H. B. DIXON ON CONDITIONS OF CHEMICAL CHANGE 
Table XXXII. 
Before the explosion. 
After the 
explosion. 
Reference 
Temperature. 
a. 
Oxygen. 
Carbonic 
oxide. 
Hydrogen. 
Carbonic 
oxide. 
Carbonic 
acid. 
Hydrogen. 
Steam. 
100 
17-3 
24 
76 
21-4 
2-6 
44T 
31-9 
° C 
0 
5-9 
101 
20'5 
3-4 
447 
31-3 
70 
4-2 
102 
20-4 
3-5 
44-7 
31-3 
80 
4-0 
103 
20-4 
3-6 
44 - 4 
3D6 
100 
4-0 
104 
15-9 
24-5 
7 5'5 
21-2 
33 
47-0 
28-5 
125 
4-0 
Between 0° and 70° a large fall of the coefficient occurs ; between 70° and 80° there 
is a slight fall; from 80° to 125° it remains constant. The high temperature constant 
with this mixture is rather higher than with mixtures containing excess of carbonic 
oxide. 
A fourth mixture, containing about equal volumes of carbonic oxide and liydi’ogen, 
was next exploded at 70°, 80°, and 120° under 1000 millims. pressure. For the purpose 
of comparison an experiment previously made with a nearly similar mixture at 14° is 
included in the table. 
Table XXXIII. 
Reference 
No. 
Before the explosion. 
After the explo-ion. 
Temperature. 
a. 
Oxygen. 
Carbonic 
oxide. 
Hydrogen. 
Carbonic 
oxide. 
Carbonic 
acid. 
Hydrogen. 
Steam. 
° C. 
75 
14-2 
52'5 
47'5 
45-3 
72 
26-3 
21-3 
14 
5 1 
105 
15‘4 
5D7 
48-3 
42-7 
8-9 
26-0 
22 3 
70 
41 
106 
42-9 
87 
26-6 
21-8 
80 
4-0 
107 
” 
55 
55 
42-8 
8 8 
26-4 
21-9 
120 
4-0 
Between 14° and 70° there is a large fall in the coefficient ; between 80° and 120° 
the coefficient remains constant. 
It is difficult to assign the marked change in the coefficient, as the initial tempera¬ 
ture is raised from 0° to 60°, to a higher temperature being reached in the combustion 
when the eudiometer is warmed. In the first place if the temperature of the flame is 
increased by the whole amount of the initial warming of the gases, this increase is 
not more than 2 or 3 per cent., whereas the coefficient is altered some 40 per cent. ; 
and secondly if such a small increase in the temperature of the flame affects the 
coefficient, we should expect the small further increase in the temperature of the flame 
by heating the eudiometer from 60° to 120° to make a further change in the coefficient. 
No change in the coefficient occurs as the temperature of the eudiometer is raised from 
