Scientific American Supplement, No. 520, December 19, 1885
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4 lb. Ofcoal is equal in its heating power to 1, 000 cubic feet of natural gas. Ifour coal cost us 5s. Per ton of 2, 000 lb. , then 54. 4 lb. Costs 1. 632d. , and 1, 000 cubic feet of gas is worth for its heat units 1. 632d. As theprice of coal increases or decreases, the value of the gas will naturallyvary in like proportions. Thus, with the price of coal at 10s. Per tonthe gas will be worth 3. 264d. Per 1, 000 cubic feet. If 54. 4 lb. Of coalis equal to 1, 000 cubic feet of gas, then one ton,... or 2, 000 lb. , is equalto 36, 764 cubic feet, or 2, 240 lb. Of coal is equal to 40, 768 cubic feetof natural gas. If we compare this gas with anthracite coal, we find that1, 000 cubic feet of gas is equal to 58. 4 lb. Of this coal, and 2, 000 lb. Of coal is equal to 34, 246 cubic feet of natural gas. Then, if this coalcost 26s. Per ton, 1, 000 cubic feet of natural gas is worth 9
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