Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 243
will burn con-tinuously, even when the bottom of the chimney isunder water. The reason will be clear if a piece ofburning touch paper (blotting paper soaked in a solu-tion of potassium nitrate and dried) is held over thechimney. The smoke will show the direction of theair currents. If the chimney… … Fig. 200. Con-vection currentsin air HEATING AND VENTILATING 211 261. Ventilation of houses. In order to secure satisfactoryventilation it is estimated that a room should be supplied with2000 cubic feet of fresh air per hour for each occupant(a gas burner is equivalent in oxygen consumption to four…
Physics
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