Anthracite 9.0
Bituminous 8.8
Petroleum 18.9
Coal gas 18.8
Generator gas 2.9
Water gas 7.8
These figures agree closely with the results of experiments.
We will now consider the subject of cost.
The following cities have been selected, as manufacturing centers,
termini of railroads, or fueling ports for steamers.
In the case of petroleum, as it is rarely shipped in the crude state, an
approximation is made by adding to the cost at the nearest shipping port
the freight charged on refined petroleum, and ten per cent. to cover
duties and other charges.
Owing to the difficulty of obtaining prices, in some of the cities,
there may be some errors.