Se , Bimmer a 
ee 
2 
Geology and Natural History. 225 
e now proceed to determine the temperature of the products 
of combustion. A simple calculation based upon the chemical 
equivalents shows that those products will be as follows: 
59°72 carbon will unite with 159-28 oxygen, forming 219°00 CO, 
3°92 sulphur - 208 e457 mt 7°84 
312 hydrogen “ 24°96) = $ 28°08 HO 
26.59 combined water and moisture, - -------------- 26°59 HO 
Total oxygen required from the air, -------- 188716 
Amount of nitrogen corresponding to 
this amount of oxygen in the air, ------- 629°86 
Amount of nitrogen already in the fuel, -.-- 10 
Total nitrogen in the products of combustion, - - -630°87 N 
units required to raise a unit of this gas one degree of tempera- 
ture—is 0-216; the specific heat of sulphurous acid is 0°155 ; that 
of steam is 0°475; and that of nitrogen is 0°244. Applying these 
numbers, we have for the heat rendered latent by each substance 
in one hundred units of the above mixture of gases: 
CO, 219°00 X 0°216 = 47°304 
S 
HO 54°67 X 0°475 = 25°968 
N 630°87 X 0°244 = 153°932 
Immaterial to this calculation. The temperature 18 the sathe, 
Whatever the quantity of fuel, provided the combustion takes 
place as above supposed, and the gases are not compressed. 
It should be remarked, finally, that the oxidation of iron in the 
ant temperature would be reduced by the diluting | effect of an 
additional quantity of nitrogen in the air required for its oxidation. 
Pure carbon yields by combustion to carbonic acid 8,080 heat 
‘nits; and the theoretic resultant temperature of th 
acid is 2.720°, It will be seen that some of the coals in the table, 
