The procedure for a combustion is as follows: - FIG.
Charcoal, coke or anthracite coal are the fuels generally used in slow combustion heating stoves.
A much better approximation to the heat of combustion of such substances is obtained by deducting the oxygen together with the amount of carbon necessary to form C02, and then ascertaining the amount of heat produced by the residual carbon and hydrogen.
The observed heat of combustion of sugar is, however, 1354000, so that the error of the rule is here 20 per cent.
In the older type the combustion chamber (of metal or glass) is sunk in the calorimeter proper, tubes being provided for the entrance and exit of the gaseous substances involved in the action.