26 CALORIFIC POWER OF FUELS. 



A complete test will now be described, giving all the cor- 

 rections. 



Suppose one gram of dried coal in fragments is used. 

 After combustion in the calorimeter, weigh the capsule con- 

 taining the cinders. 



Cinders after combustion o. 1 10 gram. 



" " calcination in the air.. . o. 100 " 



Unburnt carbon remaining in cinders o.oio *' 



Then 



Coal used, dried at 100 C 1 .000 gram. 



Cinders. . . o. 100 * c 



Pure coal (cinders out).. 0.900 " 



Carbon not burnt during the experiment., o.oio *' 



There was collected from the combustion of the hydro- 

 carbons and the carbonic oxide o. 10 gram of carbonic acid, 

 corresponding to 0.006 of carbonic oxide (molecular ratio 

 ii :/); also o.oio gram of water, corresponding to o.oon 

 gram hydrogen (molecular ratio 9 : i). 



Increase of temperature of the bath 3'7O2 



Correction 0.020 



Total increase 3. 722 



Calorimeter equiv. in water 2.114 kilos * and 3.722 X 2.114 7.8683 



Unburnt carbon o.oio X 8.o8ocal. = 0.0808 



Carbonic oxide 0.006 X 2.403 " =0.0144 



Hydrogen o.oon X 34.500 " = 0.0383 



Total calories from 0.900 gram coal completely burnt = 8.0018 



I gram pure coal = 8.891 calories, 

 i kilogram pure coal = 8891 calories, or 

 i pound " " = 16003.8 B. T. U. 



* 2000 grams of water + 114 grams for value in water of calorimeter and 

 accessories. 



