g6 CALORIFIC POWER OF FUELS. 



relation between candle power and heat of combustion of a 

 gas: 



c = i X 352.6 + 2280, 



in which c represents the heat of combustion and i the candle 

 power. The formula seems to be applicable only between 

 limits at which it has been verified from 5 to 15 candles. 

 Aguitton's determinations were made with the calorimetric 

 bomb. 



The following table gives a rtsumt of his observations : 



Candle Power. Heat ^^^ 



5 c 4043 



6 4395 



7 4748 



8 5101 



9 5453 



10 5 806 



ii 6158 



12 6511 



13 6864 



14 72 16 



15 7569 



7569 - 4043 __ ^^ ^ coeffident adopted 



The three samples of illuminating gas, analyzed and burnt 

 in the bomb by Mahler and given in the table below, call for 

 the following observations : Gas from Niddrie cannel coal, the 

 most calorific per cubic metre is the least calorific per kilo- 

 gram, because the density is greater than that of the other 

 two. The richest in hydrogen by volume (Lavillette) is the 

 poorest in calorific power per cubic metre, while the poorest 

 in hydrogen by weight is the richest in calories per cubic 

 metre. These are due to the low density of hydrogen, which 



