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Excerpt from Knowledge for the People, or the Plain Why and Because: Familiarizing Subjects of Useful Curiosity and Amusing Research
Because, when the heat begins to operate on the coal, gas is extricated; this gas carrying some of the grosser particles along with it, a heavy. Smoke is thrown out, which will not rie in the chimney, but by its own gravity is forced back into the room on which the warm air of the apartment being lighter than what comes in, instantly ascends towards the ceiling, and the lower part becomes cool. But if a portion of the fuel is taken off, then the small quan tity of active caloric, or heat, acts with greater force on the unconsumed coal, brings out its latent or ia active heat more rapidly, and thereby producing a quicker decomposition of the gases, by the increas ing combustion, the smoke becomes thinner and lighter, and though it carries up certainly more os loric with it proportionally than before, yet the' quantity of radiant heat is greater, and the temper stars of the apartment is more equalized.
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