io6 



CALORIFIC POWER OF FUELS. 



In addition to difference in composition in different local- 

 ities, the composition of the gas varies considerably from 

 time to time in each well. This is shown by the following 

 analyses made at different times within a period of three 

 months from a well at Pittsburgh, Pa. : 



The quantity of gas used daily in the town of Findlay, 

 Ohio, in 1890, was estimated by Professor Orton to be, for 



Glass-furnaces 10000000 cubic feet. 



Iron mills 10000000 " " 



Other factories 6000000 " " 



Domestic use 4000000 " " 



Total per day 30000000 * ' 



In Indiana, large wells have been opened and used as in 

 Ohio. In Pennsylvania, several of the large rolling-mills and 

 glass-houses near Pittsburg were formerly supplied with mill- 

 ions of feet per day ; but the supply, used so lavishly, became 

 exhausted. In Canada, at Fort Erie and Windsor are wells, 

 the gas from which is piped across the river to Buffalo and 

 Detroit respectively. All through the oil regions gas wells 

 are to be found more or less, accompanying every well sunk. 



From the composition of the gas, it will readily be seen 

 that it is a valuable source of heat, the calorific power reach- 

 ing 10000 calories or 1 100 B. T. U. per cubic foot. It is used 

 for domestic purposes, steam, glass making, iron mills, brick 

 burning, and numerous other ways, and until recently used 

 wastefully in all. 



