A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 565
ion to a stream of coldair, unless it be of a peculiar construction. Toavoid this defect, there should be a free supply offresh air to the lower part of the room, and theopenings contrived so that their action shall notbe interrupted by winds. It will be found an ad-vantage to let the ascending air… … where its course is indicated by the dotted lines,tlie apertures through which it ascends being con-cealed by ornamental plates A A, placed at alittle distance below them. If cold air be forcedin at the top or otherwise, it will occupy thelower part of the space, as at B B B, and cannotmake its way…
Encyclopedias and dictionaries · Aeronautics
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