results, without allowing for losses in the furnace.

The fuels to be considered are anthracite and bituminous coals, crude
petroleum, and coal, generator and water gases.

The average compositions of these fuels (considering only the heating
agents), as deduced from the analysis of eminent chemists, are:

PERCENTAGE BY WEIGHT.

________________________________________________________
| C | H | O | CO |CH_{4}|C_{2}H_{4}
+----+-----+---+----+------+----------
Anthracite |87.7| 3.3 |3.2| | |
Bituminous |80.8| 5.0 |8.2| | |
Petroleum |84.8|13.1 |1.5| | |
Coal gas | | 6.5 | |14.3| 52.4 | 14.8
Generator gas | | 1.98| |35.5| 1.46|
Water gas | | 6.3 |0.6|87.8| 1.2 |
------------------+----+-----+---+----+------+----------

We will employ the formula of Dulong--

h = 14,500 C + 62,000 (H - O/8)

to compute the theoretical heating powers of these fuels. In the case of
methane, CH_{4}, the formula is not true, but the error is not great
enough to seriously affect the result. This gives for the combustion of
one pound of: