402 Experiments on the Gas from Coal. 
TABLE III. | 
Shewing the Quality of the Gas from 11201b of Common 
Coal, at different periods of the Distillation. 
100 m. of im- {|} 100 measures of 100 measures 
puregas con- |} purified gas. |] purified. 
tain ah | Nr 
Cw J/olef, other az. |/cons. give 
sulp. carb, infl. oxy, carb. . 
hyd. acid. gases acid. 
1 hour’s gas || 3 | 3 10] 90] 0 })164 | 91 
3 hours do. jj 2 | 2 9; 91] O |/168 | 93 
5 hours do,}| 3 | 2 6 | 94] 0 |/132 | 70 
7 hours do. |! 1 3 5 | 80 | 15 ||120 | 64 
9 hours do.}) £ | 22 2) 89); 9 }}112 | 60 
11 hours ‘do.|| 1} 1 |! 0] 85} 15 | 90 1 43 
Exclusive of the azote, with which the 
three last portions of gas were mingled, they 
consumed oxygen and gave carbonic acid as 
follows. The seven hours gas in this instance, 
as sometimes happens from irregularities of 
temperature, was more combustible than that 
collected two hours sooner. 
Consumed oxygen. Gave carb. acid. 
100 m. of 7 hours gas.....140......cevceeseees PE a 
9 HOUrs. 0.0.0.6 1QB iiss cdececsesee se GO 
11 hours... ..000.106....cccsececeeeeeeeesDO 
A comparison of the results exhibited in the 
third table, with those of the distillation of 
cannel coal, is greatly in favour of the latter 
substance as a source of light. This will 
appear most distinctly, by setting against 
each other the proportions of oxygen, which 
are consumed by the gases evolved from the 
two substances at equal times from the com- 
mencement. 
