Description of the Process of Manufacturing Coal Gas, for the Lighting of Streets Houses, and Public Buildings / With Elevations, Sections, and Plans of the Most Improved Sorts of Apparatus Now Employed at the Gas Works in London and the Principal Provincial Towns of Great Britain; Accompanied With Comparative Estimates, Exhibiting the Most Economical Mode of Procuring This Species of Light

by Friedrich Christian Accum

Hours of the distillatory process	Quantity of Gas produced.
First hour	115	cubic feet
Second ditto	81	ditto
Third ditto	78	ditto
Fourth ditto	70	ditto
Fifth ditto	66	ditto
Sixth ditto	55	ditto
Seventh ditto	49	ditto
Eighth ditto	42	ditto
	555	cubic feet.

The quantity of gas is at the rate of ten thousand cubic feet to the chaldron (27 cwt.) of coal.

Experiment[14] with eighteen cylindrical Retorts, containing one chaldron of coal.

Hours of the distillatory process	Quantity of gas produced.
First hour	2000	cubic feet
Second hour	1488
Third hour	1400
Fourth hour	1301
Fifth hour	1208
Sixth hour	1000
Seventh hour	897
Eighth hour	691
	9985

This experiment was made with retorts set on the flue plan.

The coal employed was (Bewick and Craister’s Wall’s End), Newcastle coal.

[14] Communicated by Mr. T. S. Peckston, of the Westminster Gas Works.

Experiment with thirty-six parallelopipedal retorts, each containing two bushels of coal.[15]

Hours of the Distillatory Process	Quantity of Gas produced.
In the first hour	4,058
Second hour	3,028
Third hour	2,871
Fourth hour	2,526
Fifth hour	2,380
Sixth hour	1,971
Seventh hour	1,754
Eighth hour	1,450
	20,038

[15] Own Experiments.