. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. opper to a window, framed with or withoutside lights. In this are included all greenhouse sashes that are hung from the tup, whichmay be made to open simultaneously by means of ratcheted stay-bars dropping intotoothed wheels fixed on a continuous axis, worked by a wheel against an endless double windows are used, as in very cold climates, or when it is desirable to shutout noises, the upper portions of them should be made to open by the a
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. opper to a window, framed with or withoutside lights. In this are included all greenhouse sashes that are hung from the tup, whichmay be made to open simultaneously by means of ratcheted stay-bars dropping intotoothed wheels fixed on a continuous axis, worked by a wheel against an endless double windows are used, as in very cold climates, or when it is desirable to shutout noises, the upper portions of them should be made to open by the action of openingthe inner window. This scheme has been adopted in the hospital of the Wieden suburb,and also in the Imperial stables, at Vienna, with success; its action is not described, butthe outer window is presumed to be fixed, the heads of it forming a hopper, which isopened or shut by lowering or raising the inner window. 2278o. To the third class belong nearly all the modern English patents for windowventilation, ?which consist of one or more planes working like a jalousie lath upon a hori- Ghap. III. VENTILATION OF BUILDINGS. 743. zoiital axis. Of the tvro principal adaptions of the system to an entire window, Ilurwoods,shown in Jig. 808a., and worked by an endless screw, is the simplest; there is anotherarrangement of this kind by Mackrory, where theaction is similar to that of a carriage window ;the sash runs in a groove, and being turned bymeans of a toothed pivot working against an end-less screw, it can be kept at any desired method indicated by fff. 808., adopted atMiddlesex Hospital, seems more simple and moreeconomical. By turning the handle to the pointsin the plans A, B, and C, the glazed louvres aresimultaneously opened or shut to those limits. 2278/1. Veiitilition is eifected on the principleof the extracting valve, as advocated by , which is a plate of metal hinged to thelower edge of a metal box next to the room, andon the other open t
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