Experiments on the Gas from Coal. 401 
Excluding from the calculation the azotic 
gas, with various proportions of which the 
products were contaminated, the following 
table shews the quantity of oxygen gas con- 
sumed, and of carbonic acid produced, by 
the really combustible part of the gas. 
TABLE II. 
Shewing the Quality of the really combustible part of 
the Gas, at different periods of Distillation. 
Take oxygen. Give carb. acid. 
100 measures of half 
hour’s Gas ....sceseeees decPeOceveees sosvccceecel 18 
1 hour’s gas....e.ceceeees 220.0006 sce covccccnel LZ 
ida teabceiec wisi on Peery ae) | ewe cae ha giipranets 114 
Ey es ae ee Ue astsccnsccnaasead 108 
Mids stneusantwapyhcedeken suns | RE aRE oieae ae 98 
aero madenscisa ep scncps dep BED avasenassca . 85 
DES cvsnousvcvevcszereae Bobs Ang» pancnad decease 70 
Me Beh sks cen tee ha wegtats TOD. sn! demedhccoens 45 
The next set of experiments was made on 
gas from common coal, got at Clifton, near 
Manchester, and of fair average quality. 
VOL, TH. |, |, {jee 
