98 



CONTRIBUTIONS TO THE KNOWLEDGE 



SECOND EXPERIMENT. 



Cannel Dsed 112 lbs. 



Gas produced 2586 cubic feet. 



Time occupied ^ 3h. 15m. 



ILLUMINATING POWER OP GAS. 



Total gas produced when burnt at the rate of 5 feet per 

 hour, yields light = 1034.4 sperm candles. 



Hence gain in illuminating power 

 by application of water gas 

 process 



Gain in quantity of gas 



Per cwt. 

 467.4 candles. 

 1924 cub. ft. 



Per ton. 



934.8 candles. 



38,480 cub. ft. 



Per cent. 

 82.4 

 290.6 cub. ft. 



No analyses were made in connection with this experi- 

 ment, but it was carefully ascertained that the gas did not 

 contain more than a mere trace of carbonic acid. 



The experiment thus demonstrates the fact that the whole 

 of the carbonic acid is removed from the water gas during its 

 passage through the coal retort, even when Boghead cannel is 

 employed, and also that the enormous quantity of 51,720 

 cubic feet of gas, possessing a high illuminating power, is 

 capable of being produced from 1 ton of the Boghead cannel ; 

 but it does not show, as might have been expected, that the 

 additional quantity of water gas passed through the coal 

 retort has had the ejffect of preserving more of the illumi- 

 nating hydrocarbons than in the previous experiment ; on the 



