A Rudimentary Treatise On Warming And Ventilation: Being a Concise ...
A Rudimentary Treatise On Warming And Ventilation: Being a Concise ...
Charles Tomlinson
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,64), to close it. This plate should be larger than the aperture, in order that the air may be drawn into a horizontal current, for the purpose of taking away the portion of air next the ceiling. If the tube were left without a plate, the air im- mediately under it would press forward up the tube, and very little of the worst air which collects at the ceiling would escape. A flat or level ceiling is not well adapted to the purposes of ventilation ; but a still worse form of ceiling is that whic...h is divided into coffers, for in th6se the air collects, gets cooled, and descends. For effective ventilation, ceilings ought alwa3rs to be dome-shaped, coved, arched, groined, or of the form of a truncated pyramid, as shewn in Fig. 63, so as to rise in the and its place supplied with a sheet of zinc, having 220 perforationfi to the square inch. Panes of perforated glass are also abundantly supplied, as well as glass louvres. 168 VENTILATION THROUGH THE OEIUNG. Fig. 68. centre^ and at the centre or most ele- vated point, the ventilating tube, t, ii^ should be placed.
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