1) Alidad 2) Astronomical instrument 3) Measuring instrument 4) Navigational device 5) Surveying instrument 6) Surveying telescope
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https://www.crosswordclues.com/clue/alidade
1) Alidad
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https://www.crosswordclues.com/clue/alidade
An alidade (archaic forms include alhidade, alhidad, alidad) or a turning board 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 object or to measure the angle to the object from some reference point. Angles meas...
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http://en.wikipedia.org/wiki/Alidade
revolving index on astrolabe or other instrument for reading gradations
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http://phrontistery.info/a.html
• (n.) The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instrument
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http://thinkexist.com/dictionary/meaning/alidade/
(from the article `armillary sphere`) The Arabs employed similar instruments with diametric sight rules, or alidades, and it is likely that those made and used in the 12th century by ... ...with a `map` of the stars, including the aforementioned circles, that rotated on the mater around a centre pin corresponding to the north ...
Found on
http://www.britannica.com/eb/a-z/a/46
Al'i·dade noun [ Late Latin
alidada ,
alhidada , from Arabic
al-'idāda a sort of rule: confer French
alidade .] The portion of a graduated instrument, as a quadrant or astrolabe, carrying the sights or telescope, and showing the degrees cut off on the arc of the instr...
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http://www.encyclo.co.uk/webster/A/54
[
n] - surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments 2. [n] - surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
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http://www.webdictionary.co.uk/definition.php?query=alidade
That part of an optical measuring instrument comprising the optical system, indicator, vernier, etc.In modern practice the term is used principally to refer to a telescope mounted over a compass or compass repeater to facilitate observation of bearings, and to a surveying instrument consisting of a telescope mounted over a compass rose, for measuri...
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https://www.encyclo.co.uk/local/20687
alidad noun surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles
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https://www.encyclo.co.uk/local/20974
(in plane-tabling) a straightedge having a telescopic sight or other means of sighting parallel to the straightedge. · the entire upper part of a theodolite or transit, including the telescope, its supports, the level vials, the circle-reading device, and the spindle.
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https://www.infoplease.com/dictionary/alidade
No exact match found.
