174 Dr Fyfe on the Comparative Value oj Oil and Coal-Gas. 
After the condensible gas was removed, there remained, 
Azote. 
Carb. Hyd. 
Carb. Ox. 
Hydrog. 
Total. 
No. 1. 
1.5 
94.5 
4 
0 
100 
2. 
6 
82 
2 
10 
100 
3. 
2 
66 
14 
18 
100 
4. 
5 
60 
12 
23 
100 
5. 
10 
20 
10 
60 
100 
In the following Table, the oil gas of the three first experi- 
ments was procured from whale-oil, previously boiled, to free it 
from water, the heat of the retort being in each succeeding ex- 
periment reduced till it was just sufficient to decompose it. The 
fourth gas was from a London work. 
Spec. Grav. 
Lost by Chlorine. 
Gas, No. 1. 
464 
6 per cent. 
2. 
590 
19 
3. 
758 
22,5 
4. 
906 
38 *, 
After this there remained a gas composed of, 
Azote. 
Carb. Hyd, 
Carb, Ox. 
Hydrog. 
Total. 
No. 1. 
7 
30 
15 
48 
100 
2. 
5 
40 
15 
40 
100 
3. 
5 
65 
20 
10 
100 
4. 
5 
75 
15 
5 
100 
The gas condensed by chlorine is supposed to be partly ole- 
fiant, partly a volatile oil. That not condensed, the above 
Tables shew to vary in its composition. In the best specimen 
of oil-gas, the carbonic oxide is in larger proportion than in the 
best kinds of coal-gas, and the carburetted hydrogen is most abun- 
dant in the latter. The hydrogen in both appears to increase 
as the temperature at which they are formed becomes higher, 
and is always greatest in the last portions. 
