The Architectural magazine . ought to be such a one asto permit a sufficient exit of air in summer, when the differenceof temperature within and without the house is small, and con-sequently when the ventilating current is sluggish ; and it mustalso be just large enough to permit the escape of the same quan-tity of air in winter, when the difference of temperature withinand without the house is great, and consequently when the ven-tilating current is quick: conditions which are evidently impos-sible, unless the ventilator can be made to open its throat insummer, and shut it in winter, just as
The Architectural magazine . ought to be such a one asto permit a sufficient exit of air in summer, when the differenceof temperature within and without the house is small, and con-sequently when the ventilating current is sluggish ; and it mustalso be just large enough to permit the escape of the same quan-tity of air in winter, when the difference of temperature withinand without the house is great, and consequently when the ven-tilating current is quick: conditions which are evidently impos-sible, unless the ventilator can be made to open its throat insummer, and shut it in winter, just as much as is necessary. I shall now describe a ventilator having these \Jig. 26., let a bhe Q. square crib, frame, or box, placed on theroof, having two doors, c and d, hung on centres at e andy. If we can open and shut these doors according to the degreeof ventilation required, our object is attained. In order to effect this, let the end g h o^ the crib projectVol. I. — No. 2. f 66 Ventilation of Living-Rooms,. below the roof, leaving air passages, m. n. ?p, &c., between its bottom and the roof; and let the bottom of the crib be opentowards the inside of the house, except in so far as it is partiallyclosed by the damper h. This damper is attached to the doorsc and d by pieces of cord, light wood, or iron hoops, and itsweight is just sufficient to open the doors to the full extent re-quired. Now, it is evident that a very small force of air at theunder side of the damper k would push it upwards, and therebyshut the doors c and (l\ and, by pushing up the damper /•, thepassage of the air by the openings ?«, n^ />, &c., is prevented:but the passages /w, w, jo, &c., and the doors c and r/, can neverbe closed completely, because, by closing the doors c and d to acertain extent, the exit of the air is prevented accordingly, andit thereby prevents the damper k from rising any farther; thatis, the air presses upon the upper side of the damper, and uponits under side,
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Keywords: ., bookcentury1800, bookdecad, booksubjectarchitecture, bookyear1834
