The following particulars are required to be stated by those who are desirous of receiving estimates, concerning the comparative economy of applying coal gas as a substitute for oil, wax, or tallow light.
1. A plan of the place to be lighted with Gas, drawn to a scale not less than one tenth of an inch, to ten feet. The design must exhibit the particular spot, where the Machinery is to be erected.
2. The kind of gas lights required, namely; whether the lights shall be equal in illuminating power to one, or more tallow candles of a given weight, or equal to an argand lamp.
3. The number of lights.
4. The average time the lights are to burn, throughout the year.
5. The average price of coal, and rate of workmen’s wages, at the place where the light is wanted.
AN
ACCOUNT
OF THE
PROCESS OF MANUFACTURING
Coal Gas.