Keystone Bank
Keystone or key-stone or ''variation'', 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 Business * Keystone Law, a full-service law firm * Digital Keystone, a developer of digital entertainment software * Keystone Aircraft Corporation * Keystone Bridge Company, an American bridge building company * Keystone (beer brand) * Keystone Camera Company * Keystone (gasoline automobile) * Keystone (steam automobile) * Keystone Pipeline The Keystone Pipeline System is an oil pipeline system in Canada and the United States, commissioned in 2010 and owned by TC Energy and as of 31 March 2020 the Government of Alberta. It runs from the Western Canadian Sedimentary Basin in Albert ..., a crude oil pipeline * Swiss Telegraphic Agency, Keystone-SDA/Keystone-ATS, a Swiss press agency * Keystone View Company, a US photo agency * Keystone (Berkeley, California), a defunct music club Entertai ...
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Keystone (architecture)
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 bear weight. In arches and vaults (such as quasi-domes) keystones are often enlarged beyond the structural requirements and decorated. A variant in domes and crowning vaults is a lantern. Keystones, as a hallmark of strength or good architecture, or their suggested form are sometimes placed in the centre of the flat top of doors, recesses and windows for decorative effect, so as to form an upward projection of a lintel. Although a masonry arch or vault cannot be self-supporting until the keystone is placed, the keystone experiences the least stress of any of the voussoirs, due to its position at the apex. Old keystones can decay due to vibration, a condition known as bald arch. Architecture In a rib-vaulted c ...
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