arch keystone

arch keystone
замок свода, замковый камень свода

Англо-русский словарь по ядерным испытаниям и горному делу. 2013.

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  • Keystone — may refer to:* Keystone (architecture), the piece at the apex of an arch or vault * The Keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle * Keystone correction for these types of… …   Wikipedia

  • Keystone Aircraft — Corporation was an early pioneer in airplane manufacturing. Headquartered in Bristol, Pennsylvania, it was formed as Ogdensburg Aeroway Corp in 1920 by Thomas Huff and Elliot Daland, but its name was quickly changed to Huff Daland Aero Corp, then …   Wikipedia

  • Arch — • A structure composed of separate pieces, such as stone or bricks, having the shape of truncated wedges, arranged on a curved line so as to retain their position by mutual pressure Catholic Encyclopedia. Kevin Knight. 2006. Arch     Arch …   Catholic encyclopedia

  • Keystone — Key stone , n. (Arch.) The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of {Arch}. [1913 Webster] …   The Collaborative International Dictionary of English

  • keystone — (n.) stone in the middle of an arch, which holds up the others, 1630s, from KEY (Cf. key) (n.1) in figurative sense of that which holds together other parts + STONE (Cf. stone). Figurative sense is from 1640s. Pennsylvania was called the Keystone …   Etymology dictionary

  • keystone — ► NOUN 1) a central stone at the summit of an arch, locking the whole together. 2) the central principle or part of a policy or system …   English terms dictionary

  • keystone — [kē′stōn΄] n. 1. the central, topmost stone of an arch, popularly thought of as especially holding the others in place: see ARCH1 2. that one of a number of associated parts or things that supports or holds together the others; main part or… …   English World dictionary

  • Keystone (architecture) — A keystone is the architectural piece at the crown of a vault or arch and marks its apex, locking the other pieces into position.cite book last =Ching first =Francis D.K. authorlink = coauthors = title =A Visual Dictionary of Architecture… …   Wikipedia

  • ARCH —    The arch was invented around 2500 BC in the Indus Valley of ancient India. It is a curved structure that rests on posts or walls and allows for the spanning of an architectural space. Prior to the use of the arch, the post and lintel structure …   Historical Dictionary of Architecture

  • Keystone species — A keystone species is a species that has a disproportionate effect on its environment relative to its abundancecite journal author=Paine, R.T. year=1995 title=A Conversation on Refining the Concept of Keystone Species journal=Conservation Biology …   Wikipedia

  • arch — arch1 /ahrch/, n. 1. Archit. a. a curved masonry construction for spanning an opening, consisting of a number of wedgelike stones, bricks, or the like, set with the narrower side toward the opening in such a way that forces on the arch are… …   Universalium

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