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Intersecting bar tracery (c. 1300) deployed mullions without capitals which branched off equidistant to the window-head. [1] The window-heads themselves were formed of equal curves forming a pointed arch and the tracery bars were curved by drawing curves with differing radii from the same centres as the window-heads. [1]
A window sill in the most general sense is a horizontal structural element below a window opening or window unit in masonry construction or framed construction and is regarded as part of the window frame. The bottom of a window frame sits on top of the window sill of the wall opening. [1]
Transom windows which could be opened to provide cross-ventilation while maintaining security and privacy (due to their small size and height above floor level) were a common feature of apartments, homes, office buildings, schools, and other buildings before central air conditioning and heating became common beginning in the early-to-mid 20th century.
It is also often used as a division between double doors. When dividing adjacent window units its primary purpose is a rigid support to the glazing of the window. Its secondary purpose is to provide structural support to an arch or lintel above the window opening. Horizontal elements separating the head of a door from a window above are called ...
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
The jambs of a window outside the frame are called reveals. Small shafts to doors and windows with caps and bases are called jamb-shafts; when in the inside arris of the jamb of a window, they are sometimes called scoinsons. [2] A doorjamb, door jamb, or sometimes doorpost is the vertical portion of the door frame onto which a door is secured. [3]
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In light-frame construction, a trimmer is a timber or metal beam (joist) used to create an opening around a stairwell, skylight, chimney, and the like. Trimmers are installed parallel to the primary floor or ceiling joists and support headers, which run perpendicular to the primary joists.