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alidade

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al·i·dade  (l-dd) also al·i·dad (-dd)
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-'ida, the revolving radius of a circle : al-, the + 'ida, revolving radius (alternate form of 'aud, humerus, from 'aada, to lop, cut (trees); see d in Semitic roots).]
alidade [ˈælɪˌdeɪd], alidad [ˈælɪˌdæd]
n
1. (Mathematics & Measurements / Surveying) a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
2. (Mathematics & Measurements / Surveying) the upper rotatable part of a theodolite, including the telescope and its attachments
[from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle]
ThesaurusLegend:  Synonyms Related Words Antonyms
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
alidad
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
alidad
surveying instrument, surveyor's instrument - an instrument used by surveyors
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The mater can be suspended from a hook and its back is calibrated so that, with the aid of a sighting bar called the alidade, the altitudes of the Sun or stars can be observed.
The Astrolabe by Glass, Ian / Monthly Notes of the Astronomical Society of Southern Africa
When I see smoke, I line it up on the alidade table and get a line of sight on it.
On the job by Telegram & Gazette (Worcester, MA)
Plane table and alidade were used to map paleosols and topography along six dune faces (Figure 4).
The history of dune growth and migration along the Southeastern shore ... by Hansen, Edward C.; Arbogast, Alan F.; Yurk, Brian / Michigan Academician
 
 
 
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