The woman's book : dealing practically with the modern conditions of home-life, self-support, education, opportunties, and every-day problems (1894)
New York : C. Scribner's sons · leaf 301
t—that ithas the power of rising of itself. Thisis not so ; it rises only because it islighter than the cold air around it. Itdoes so for the same reason that acork rises to the surface of water andfloats, or that air itself rises throughwater and floats. Now the reason thathot air is lighter is… … Fig. IV.—A practical ventilator. - more force against it, and, being heav-ier, glides under it and drives it up-ward. Unless some arrangement ismade so that the cooler air can do this,the warmer does not rise at all. It is,therefore, necessary to have a cold-airbox connected with a furnace in sucha…
Women · Home Economics · Interior decoration
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