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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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44

QUANTITY OF GAS OBTAINABLE

One Chaldron of Coal , produces Cubic feet of Gas-

Scotch Cannel coal.19,890

Lancashire Wiggan coal.19,608

Yorkshire Cannel coal,

(Wakefield).18,860

Staffordshire coal

First variety ,f.9,748

Second variety,. 10,223

Third variety .10,866

Fourth variety.9,796

Gloucestershire coal,+

First variety, (Forest of Dean , High

Delph).16,584

Second variety, (Low Delph) . . 12,852

Third variety, (Middle Delph) . . 12,096

Newcastle coal,

First variety, (Hartley).16,120

Second variety, (Cowper’s High Main) 15,876Third variety , (Tanfield Moor) . . 16,920

Fourth variety, (Pontops) .... 15,112/

* They require a much higher temperature, than is necessary for thedecomposition of Newcastle coal.

■f For the maximum quantity of gas produced from this and thethree succeeding varieties of coal, I am indebted to J. Gostling, Esq.Proprietor of the Birmingham Gas Works.

J Most varieties afford a porous, and very friable coke.

 
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