OF THE MANUFACTURE OF OAS. 



99 



contrary, a slight diminution of total illuminating power is 

 seen on comparing the results of the two experiments. But 

 this diminution is accounted for, when we consider that the 

 first experiment was made in summer, whilst the last was 

 performed during the last frost and with the holder covered 

 with snow; the gas therefore passed through a species of 

 ice-test, and suffered a small diminution of illuminating 

 power, the extent of which we shall speak of presently. 



LESMAHAGO CANNEL. 



I.— WITHOUT WATER GAS. 



Cannel used 1121b8. 



Gas produced 531 cubic feet. 



Coke left 54ilbs. 



Time occupied 3h, 20m. 



ILLUMINATING POWER OP GAS. 



Total quantity of gas when burnt at the rate of 4 feet per 

 hour, yields light = 381 sperm candles. 



PER CENTAGE COMPOSITION OP i)RY GAS. 



Hydrocarbons and defiant gas eqilivalent to 28.30 pet 



cent, defiant gas .; 16.31 



Light carburetted hydrogen 42.01 



Hydrogen 26.84 



Carbonic oxide 14.18 



Carbonic acid gQ 



Oxygen and nitrogen (traces) . 



100.00 



