340 Dr. Henry's Experiments on the Gas from Ccal. [Nov. 



The next set of experiments was made on gas from common 

 coal, got at Clifton, near Manchester, and of fair average 

 quality. 



Table III 

 'I 

 Showing the Quality of. the Gas from 1120//;. of Common Coalfit 

 different Periods of the Distillation. 



Exclusive of the azote, with which the three last portions o. 

 gas were mingled, they consumed oxygen, and gave carbonic 

 acid as follows. The seven hours' gas in this instance, as some- 

 times happens from irregularities of temperature, was more 

 combustible than that collected two hours sooner. 



• ■ . . . . 



Consumed oxygen. Gave carb. acid. 



... 140 .". 75 



J do bo 



106 50 



100 m. of 7 hours' gas .... 

 o 



11 



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 

 oyxgen which are consumed by the gases evolved from the two 

 substances atequnl times from the commencement. 



TABLE IV. 



. . i bx? 

 Coviparative Table of thz Qualities of the Gases from Wigaii 

 Cannel, and from commoii Coal, ct equal Times from the 

 Co?nmcncement of the Distillation. 



Oxygen consumed by 100 Oxygen consumed by lOO 



m. of cannel gas. m. of Clifton coal gas. 



1 hour's gas 220 1 64 



3 ......' 210 168 





5 206 * ' 1 3° 



7 . . '^00 140 



9 176 i°r> 



'.'.'.'.'.'. 150 .' !'.'.' !-.".'. '.'.'.'.'.'. 106 



11 



It appears from these experiments, "that the gas from cannel 



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