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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 Fredrick Accum
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OF GAS EVOLVED AT DIFFERENT PERIODS. 79

is the very means of protecting - from becomingdecomposed.

A striking exemplification of this statementwill be seen in the following table, exhibitingthe resnlt of the progressive produce of coalgas, obtainable, in a given time, by means of cylin-drical and parallelopipedal retorts.

Experiment with one cylindrical Retort, con-taining tioo bushels of coal.

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 thousandcubic feet to the chaldron (27 cwt.) of coal.

 
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