OF THE MANUFACTURE OF GAS. 107 



Illuminating power of total gas when burnt at the rate of 

 5 feet per hour = 207.8 candles. 



No analyses of this and the following specimen of gas were 

 made. 



II.— WITH WATER GAS. 



Cannel used 112 lbs. 



Gasprodaoed 775 cubic feet. 



Coke 67|lbs. 



Time occupied 3h. IS m. 



ILLUMINATING POWER OF GAS. 



Illuminating power of total gas when burnt at the rate of 5 

 feet per hour = 296 candles. 



Hence — 



Gain in illominating power by the 



employment of water gas ... = 



Gain in total quantity of gas ... = 



Per owt. 



88.2 candles. 

 253 cubic feet. 



Per ton. 



1764 candles. 

 5060 cubic ft, 



Per cent. 



42.4 

 48.5 



NEWCASTLE COAL, (PELTON.) 



I have not ascertained the results which this coal yields 

 with water gas, owing to an experiment which I made being 

 rendered useless by the occurrence of a leakage in the appa* 

 ratus, the sample of coal at my disposal being so nearly 

 exhausted as not to leave a sufficient quantity for a repetition 

 of the trial. The following examination of the gas produced 

 from the coal distilled without water gas, may not, however, 

 prove entirely uninteresting. 



