. A treatise on hygiene and public health . proportionate to the square root of the difference between thetemperature inside of the chimney and that of the outer air. A difference of 20°-30° C, or 36°-54° F., between the chimney and. Fig. 28.—Diagram of system of ventilation by extraction : C, cellar ; A, hot-air chambercontainiag a furnace, from which the air is led by pipes in the usual way. From the chamberthe air is seen passing horizontally till it reaches the exhaust-shaft, B, where it rises to a con-siderable height. Openings under the seats lead the foul air to a point which communicat
. A treatise on hygiene and public health . proportionate to the square root of the difference between thetemperature inside of the chimney and that of the outer air. A difference of 20°-30° C, or 36°-54° F., between the chimney and. Fig. 28.—Diagram of system of ventilation by extraction : C, cellar ; A, hot-air chambercontainiag a furnace, from which the air is led by pipes in the usual way. From the chamberthe air is seen passing horizontally till it reaches the exhaust-shaft, B, where it rises to a con-siderable height. Openings under the seats lead the foul air to a point which communicateswith the shaft. (FromBosc.) the open air, is required in order to secure abundant and constant ven-tilation. In summer, therefore, the chimney requires to be heated to ahigher point than in winter, in order to give an equal effect; or, in otherwords, without special arrangements, the draught will become slack insummer. The flue of a cooking-stove, or some other heating-apparatus,may be used temporarily to increase draught. A permanent source ofheat, by summer and winter, must also be furnished, in order to securea degree of uniformity in results. There will be days when a chimneynot specially warmed will draw well; but on
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthygiene, bookyear1879
