. Ventilation for dwellings, rural schools and stables. ut of doors, musthave a mechanism securing a continuous forced change ofair; and the respiratory movements of every air-breathinganimal tell of the same imperative need. And yet, dwell-ings and stables are planned, adopting increasingly closeconstruction, allowing ventilation to be brought about inci-dentally as it may, without special provision. Only lastsummer in conversation with a New York City architect itappeared that he had recently completed a residence in ce-ment concrete and was much surprised to find that the fire-place would i
. Ventilation for dwellings, rural schools and stables. ut of doors, musthave a mechanism securing a continuous forced change ofair; and the respiratory movements of every air-breathinganimal tell of the same imperative need. And yet, dwell-ings and stables are planned, adopting increasingly closeconstruction, allowing ventilation to be brought about inci-dentally as it may, without special provision. Only lastsummer in conversation with a New York City architect itappeared that he had recently completed a residence in ce-ment concrete and was much surprised to find that the fire-place would invariably smokeunless a door or window ofthe room was open. Here is perhaps a morestriking demonstration of theneed of ventilation and of thefact that air once breathedhas lost in sustaining the illustration, Fig. 7,from a photograph, a coil ofmagnesium ribbon is shownburning in ordinary air sup-plied by convection currentsthrough the open mouth of atwo-quart Mason jar. Theintense light which fills thesmoke escaping above showFig. 8 is Fig. 7.—Magnosium ril)i)oiburning in ordinary air. jar and thehow strong cloud of white is the burning; while in Composition of the Atmosphere. 13 a similar piece of the same ribbon burning in the same jar,but here supplied with air from the lungs, conveyedthrough the rubber tube. Verymarkedly less intense is theburning and the light pro-duced in this case, and farless is the cloud of is of course the diminishedvolume per cent of oxygencarried by the respired airwhich causes the difference inthe intensity of burning, forthe rate of change of air isgreater in this case. The composition of puredry air and of air carrying75 per cent of its saturatedvolume of moisture, deducedfrom data of Clarke publishedin 1908 from the most recentand authoritative determina-tions, are given in the nexttable:
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventilation, bookyear
