alidade

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Related to alidades: telescopic alidade

al·i·dade

 (ăl′ĭ-dād′) also al·i·dad (-dăd′)
n.
1. An indicator or a sighting apparatus on a plane table, used in angular measurement.
2. A topographic surveying and mapping instrument used for determining directions, consisting of a telescope and attached parts.

[French, from Medieval Latin alidada, sighting rod, from Arabic al-'iḍāda, the revolving radius of a circle : al-, the + 'iḍāda, revolving radius (alternate form of 'aḍud, humerus, from 'aḍada, to lop, cut (trees); see ʕṣ́d in Semitic roots).]

alidade

(ˈælɪˌdeɪd) or

alidad

n
1. (Surveying) a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
2. (Surveying) the upper rotatable part of a theodolite, including the telescope and its attachments
[C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle]

al•i•dade

(ˈæl ɪˌdeɪd)

n.
1. a straightedge with a telescopic sight, used on a plane table for topographic surveying.
2. the entire upper part of a theodolite or transit.
[1400–50; late Middle English allydatha < Old Spanish alhidada < Medieval Latin < Arabic al-‘iḍādah the turning radius (like a clock hand) of a circle]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.alidade - surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachmentsalidade - surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments
surveying instrument, surveyor's instrument - an instrument used by surveyors
theodolite, transit - a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod
2.alidade - surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring anglesalidade - surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
surveying instrument, surveyor's instrument - an instrument used by surveyors
Translations
References in periodicals archive ?
00 EA Surveying Instruments and Accessories: Alidades, Compasses,
Desde esta linea, denominada "nueva economia institucional" se vinculan costos y beneficios para "controlar" al maximo las extern alidades.
Bigger plane tables were used for graphic triangulation (Novotny 1909), featured with peep-sight alidades and telescopic level diopters.