London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 79
or 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 properties.lx\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… … 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…
Architecture
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