94 



CONTRTBDTIONS TO THE KNOWLEDGE 



ILLUMINATING POWER OP GAS. 



Shadow Test. 



.576 cubic feet per 



hour 



= 1 candle. 



2 feet per hour. 3 feet per hour. 



Fish-tail No. 2. 



Press. .7 in. 



= 8.6 candles. 



Fish-tail No. 2. 



Press. .6 in. 

 = 13.7 candles. 



4 feet per hour. 



Fish-tail No. 2. 



Press. .6 in. 



= 15,8 candles. 



5 feet per hour. 



Fish-tail No. 4. 



Press. .5 in. 



= 20 candles. 



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

 hour, yields light = 322*4 sperm, candles. 



PER CENTAGE COMPOSITION OF DRY GAS. 



Hydrocarbons and defiant gas equivalent to 13 72 per | 



cent, defiant gaa J 



Light carburetted hydrogen 27*20 



Hydrogen 47'39 



Carbonic oxide ]4'86 



Carbonic acid 0*00 



Oxygen and Nitrogen, (traces) 



10000 



ACTUAL CONSTITUENTS. 



Cubic feet. 



Hydrocarbons and defiant gas 83-77=1 08*9 defiant gajs. 



Light carburetted hydrogen 215*97 



Hydrogen 376*28 



Carbonic oxide 117*99 



Watery vapour 11*99 



806*00 



Amount of carbonic acid generated by 1 volume of con- 

 densible hydrocarbons = 2*60 volumes. 



>■ 



Per cwt. 

 6 candles. 



Hence gain in illuminating power by 

 the employment of water gas . 



And gain in defiant gas =27*63 cub. ft, 



Gain in quantity of gas =261 " " 



Per ton, 

 1632 candles. 



352*6 cub. ft. 

 5*220 " " 



Per cent. 

 33*9 candles. 



34 cub. ft. 

 47*9 " " 



