Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 72
oot, while artificial gas gives only half as much, or 600B. T. U.s per cubic foot. There are many kinds of coal, but we usually speak oftwo, hard and soft The hard coal is clean, that is, ithas little dust in it and gives off little smoke when it burns. 60 FUELS 61 The soft coal is full of dust and… … Figure 44. — Kerosene Used as a Fuel in the Cook Stove. is burned, but more is available in some fuels than in others.This is true of coal. Hard coal would give only about 2000B. T. U.s per pound more than soft coal, if one could get allthe heat. But a great deal more heat is lost in the case…
Physics
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