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Splayed opening
Wall opening which widens on one side From Wikipedia, the free encyclopedia
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In architecture, a splayed opening (also splayed reveal[1]) is a wall opening that is narrower on one side of the wall and wider on another. When used for a splayed window, it allows more light to enter the room. In fortifications, a splayed opening is used to broaden the arc of fire (cf. embrasure, loophole).[2]

Splayed arch
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Perspective


A splayed arch (also sluing arch[3]) is an arch where the springings are not parallel ("splayed"), causing an opening on the exterior side of an arch to be different (usually wider) than the interior one. The intrados of a splayed arch is not generally cylindrical as it is for typical (round) arch, but has a conical shape.[4][5]
José Calvo-López, a Spanish scholar of architecture, subdivides the splayed arches into symmetrical (where both springers form the same angles with the faces of the wall), and the ox horn arches, where one springer is orthogonal to the wall, and another is not, creating a "warped" intrados[4] (the use of the term "ox horn" should not be confused with French: corne de vache, "cow's horn" — a design technique that was used for skew arch profiles).
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Double-splayed window

Double-splayed windows, widening towards both wall faces, with the narrowest part in the middle of a wall, are common in the Anglo-Saxon architecture, although the use of this trait for dating is questionable,[6] and English church buildings of the 12th century have such windows too.[7]
Portals
Widely splayed portals (also splayed jambs, as opposed to un-splayed "square jambs") were used in the Gothic architecture to display sculpture on the western facades of churches.[8]
- Prince's portal at the Bamberg Cathedral
See also
- Hagioscope, a splayed opening for observation
- Squinch, a conical-shaped vault spanning the inner corner between two walls.
References
Sources
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