London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 514
nd the smoke is allowed to escape only by aperturesin the sides, each of which has fitted to it a shutter, hung on apivot near the top, that will open in consequence of a balanceweight attached to it when no wind blows against it, but whichis so poised as to close directly when there is, and which… … e e are the shutters, hung on the pivotsyy; and g g are theweights to cause the shutters to remain open when the winddoes not blow against them. One side is represented open, andthe other closed. The shutters are of plate iron, fixed in cast-iron frames; and the whole may be kept for sale in a…
Architecture
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-134-49.webp)
