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The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
There is a central blocked arched flanked by walls, and on the lake side is an arch with a pendant keystone. The interior is domed, and contains five niches with keystones and voussoirs. Flanking the entrance are retaining walls. [4] [6] Stables, wall, courtyard and kennels, Wallingwells Hall
A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support at its top. [2] These are cantilevered from a footing and rise above the grade on one side to retain a higher level grade on the opposite side.
The brook flows over a dam and west down a concrete-lined channel, paralleled by a stone path on the south bank. Midway along it is a small stone foot bridge, with battered stone piers and an arch, with the same voussoirs as the retaining wall arch but a shouldered keystone.
Historic England, "Retaining walls, steps and fountain to east and south of formal garden at Broughton Hall, Broughton (1301267)", National Heritage List for England Historic England, "West Lodge to Broughton Hall and attached screen wall and gatepiers, Broughton (1132293)" , National Heritage List for England , retrieved 23 April 2024
For the sake of comparison, a semicircular arch with wedge-shaped voussoirs maintained by a central keystone ("true arch"). A corbel arch (or corbeled / corbelled arch ) is an arch -like construction method that uses the architectural technique of corbeling to span a space or void in a structure, such as an entranceway in a wall or as the span ...