sight alidade

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• Alidade — An alidade (archaic forms include alhidade, alhidad, alidad) is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to draw a line on a plane table in the direction of the …   Wikipedia

• alidade — /al i dayd /, n. Survey. 1. (in plane tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge. 2. the entire upper part of a theodolite or transit, including the telescope, its supports, the level …   Universalium

• alidade — al•i•dade [[t]ˈæl ɪˌdeɪd[/t]] n. 1) sur a straightedge with a telescopic sight, used on a plane table for topographic surveying 2) sur the entire upper part of a theodolite or transit • Etymology: 1400–50; late ME allydatha < OSp alhidada < …   From formal English to slang

• Theodolite — A theodolite (IPA en|θiːˈɒdəlаɪt) is an instrument for measuring both horizontal and vertical angles, as used in triangulation networks. It is a key tool in surveying and engineering work, particularly on inaccessible grounds, but theodolites… …   Wikipedia

• Plane table — A plane table is a device used in surveying and related disciplines to provide a solid and level surface on which to make field drawings, charts and maps.HistoryThe first known instrument for directly producing a drawing of a site was developed… …   Wikipedia

• surveying — /seuhr vay ing/, n. 1. the science or scientific method of making surveys of land. 2. the occupation of one who makes land surveys. 3. the act of one who surveys: The surveying required nearly two days. [1425 75; late ME: act of examining… …   Universalium

• ГОСТ 21830-76: Приборы геодезические. Термины и определения — Терминология ГОСТ 21830 76: Приборы геодезические. Термины и определения оригинал документа: 50. Алидада D. Alhidade F. Alidade Определения термина из разных документов: Алидада 80. Ампула уровня D. Röhre E. Level vial F. Fiole de niveau… …   Словарь-справочник терминов нормативно-технической документации

• Sextant (astronomical) — This article is about the Sextant as used for astrometry. For the navigator s sextant, see Sextant . Sextants for astronomical observations were used primarily for measuring the positions of stars. They are little used today, having been replaced …   Wikipedia

• Ordnance QF 18 pounder — Australian gun crew in action in the Ypres sector, 28 September 1917 Type Field gun Place& …   Wikipedia

• Ceiling projector — The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (304.8 m) away and wherever possible set… …   Wikipedia

• Osborne Fire Finder — An Osborne Fire Finder device used in fire lookout towers. The Osborne Fire Finder is a type of alidade used by fire lookouts in order to find a directional bearing (azimuth) to smoke in order to alert fire crews to a wildland fire. Contents …   Wikipedia