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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 ...
Concrete paver blocks laid in a circular pattern Concrete paver blocks in a rectangular pattern. A paver is a paving stone, sett, tile, [1] brick [2] or brick-like piece of concrete commonly used as exterior flooring. They are generally placed on top of a foundation which is made of layers of compacted stone and sand.
Keystone or key-stone may refer to: Keystone (architecture), a central stone or other piece at the apex of an arch or vault; Keystone (cask), a fitting used in ale casks;
A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel. Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs.
Keystone marker for Benton, Columbia County, Pennsylvania. Many of the markers are currently damaged or in need of maintenance. Keystone markers are a now-defunct system of roadside signage developed by Pennsylvania Department of Highways shortly after the First World War, placed outside cities, towns, and boroughs in the state of Pennsylvania. [1]
3. A concrete slab immediately outside a vehicular door or passageway used to limit the wear on asphalt paving due to repetitive turning movements or heavy loads. Apse A vaulted semicircular or polygonal end of a chancel or chapel. That portion of a church, usually Christian, beyond the "crossing" and opposite the nave.