springing: the part where an arch begins.
squinch: small arch diagonally across an internal angle of a square building, smoothing the transition to a circular or polygonal structure.
Springing
(a) the architectural member of an arch that is the first to curve inward from the vertical; (b) the point at which this curvature begins.
Squinch ...
Springing / Springer
In architecture, this is the lowest voussoir of an arch. The point where the vertical support for an arch (or vault) terminates and the curve of the arch (or vault) begins is called the spring line.
Springing - The lowest point of an arch; the face of its bearing on the abutment (c/f and skewback).
In the earlier stage of rib vaulting, the arched ribs consisted of independent or separate voussoirs down to the springing; the difficulty, however, ...
Jack arch: shallow segmental vault springing from beams, used for fireproof floors, bridge decks, etc.
Rise - vertical height between springing line and underside of keystone.
Semi-arch - an arch where only one part of its span is complete as for example in a flying buttress. - (Illustration) ...
Various types of arches exist, according to the form of the curve: round arch - semicircular with the centre on the springing line; segmental arch - where the span is less than the diameter and the curve is semi-circular; ...
Moresque, naos, order, orientation, polychromy, postiche, profile, prostyle, pulvinate or pulvinated, queen post, rampant, rendering, respond, return, rhythm, ribbon development, rise, rusticate, sexpartite, shaft, shafting, shell, soffit, springing, ...
the expedient was adopted of constructing half-barrel vaults springing from the aisle walls and abutting against the vaults of the nave beneath the lean-to roof.
A further development was the flying buttress which arched externally from the springing of the vault across the roof of the aisle to a large buttress pier projecting well beyond the line of the external wall.
The architects of the cathedrals found that, since the outward thrusts of the vaults were concentrated in the small areas at the springing of the ribs and were also deflected downward by the pointed arches, ...
Spandrel - Area between top of a column or pier and the apex of the arch springing from it.
Splay - Chamfer, or sloping face.
Spring - Level at which the springers (voussoirs) of an arch rise from their supports.
Fan vault: A concave conical vault whose ribs, of equal length and curvature, radiate from the springing (the point where an arch rises from its supports) like the ribs of a fan
Groin(ed) arch: One arched division of a cross vault ...
the projection, often moulded, at the springing of an arch, upon which the arch appears to rest.
Incised
engraved.
Dosseret, or impost block - the cubical block of stone above the capitals in a Byzantine church, used to carry the arches and vault, the springing of which had a superficial area greatly in excess of the column which carried them.
Haunch - Part of an arch, roughly midway between the springing line and crown, where the lateral thrust is strongest.
Cubical block of stone above the capitals in a Byzantine church, used to carry the arches and vault, the springing of which had a superficial area greatly in excess of the column which carried them.
double-hung window ...
Nave elevation of Chartres: nave arcade, triforium, and clerestory. Note how the clerestory windows begin below the springing of the vault.
Flying Buttresses from the north side of Chartres Cathedral.
Winder - A tapered tread in a turning part of a staircase (or circular stair) radiating from a common springing point at the newel post ...
SPANDREL The almost triangular area contained by the outer curve of an arch, the horizontal line drawn from its apex, and the vertical line drawn from its springing.
Round arches are formed from a continuous curve which has its centre at a point directly below the apex and level with the springing of the arch on either side.
States in the later 1880s after buildings in New York reached ten stories SORI: the curved eaves line of a Japanese roof SPANDREL: the triangular space between the side of an arch, the horizontal above its apex, and the vertical of it's springing; ...
Spandrel: The roughly triangular wall space between two adjacent arches; Area between top of a column or pier and the apex of the arch springing from it. Spiral staircase: A staircase whose steps wind around a central, vertical axis.
 See also: Spring, Frame, Timber, Decorated, Moulding
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