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The following table exhibits the maximum quantity of gas obtainable from the first class of coal.ssss1

ssss1 Own Experiments, made at the Royal Mint Gas-Works.

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,ssss1 First variety,ssss1 9,748 Second variety, 10,223 Third variety, 10,866 Fourth variety, 9,796 Gloucestershire coal,ssss1 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) 15,876 Third variety, (Tanfield Moor) 16,920 Fourth variety, (Pontops) 15,112

ssss1 They require a much higher temperature, than is necessary for the decomposition of Newcastle coal.

ssss1 For the maximum quantity of gas produced from this and the three succeeding varieties of coal, I am indebted to J. Gostling, Esq. Proprietor of the Birmingham Gas Works.