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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 ...
The keystone is the centre stone or masonry unit at the apex of an arch. The springer is the lowest voussoir on each side, located where the curve of the arch springs from the vertical support or abutment of the wall or pier. [1] The keystone is often decorated or enlarged.
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.
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 ...
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.
Other notable buildings include the Keystone Block, Fisher Brothers Paper Building (1914), The Bash Building (1895), and The Pinex Company Building (1917). [ 2 ] It was listed on the National Register of Historic Places in 1993.
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1680 Stringtown Road, Grove City, OH · Directions · (614) 539-4554
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