138 CALORIFIC POWER OF FUELS. 



in which 



V = volume of waste gases at o and 760 mm. in cubic metres; 

 v = " " CO a in litres per cubic metre of gases; 



/ < < < < ("*(") < t < < * < ' < < < * * * * 



z/" = " " carbon vapor per cubic metre of gases ; 



C = weight of carbon in grams, contained in I kilogram of 



coal; 

 c = weight of carbon in grams, contained in cinders from I 



kilogram of coal. 



NOTE. The above calculation in English units would be as follows: 



Weight of i cubic foot of carbonic acid o. 12274 1. 



" " i " " " " oxide 0.07811 " 



" " i " " " carbon vapor 0.06693 " 



v X 0.12274 X 3 



- = o.o 33 5f. 



v' X 0.0781 1 X 3 



= Q.0335Z/'. 



0.06693^" = weight of carbon in vapor. 

 C = o.0335(z/ + v') + 0.06693^". 



1000 cubic feet of gases having 60 cubic feet of CO 2 , 10 cubic feet of CO 

 and i cubic foot of C vapor would give 



C = 0.0335(60 -[- 10) -f 0.06693 X i = 2.412 Ibs. carbon. 

 I pound of coal has 80.4 per cent carbon; then 



2.412 : looo = 0.804 : 333^ cubic feet of gases produced from I Ib. of coal. 

 The general formula is 



r. ~ 



v') 

 in which 



V = volume in cubic feet of gases produced; 



v of CO 2 in cubic feet per 1000 cubic feet; 



v' = " " CO " 



v" = " " carbon vapor in cubic feet per 1000 cubic feet; 



C = weight of carbon in coal in thousandths of a pound; 



f = ' cinders per pound of coal in thousandths. 



