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alidade
[ al-i-deyd ]
noun
, Surveying.
- (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.
alidade
/ ˈælɪˌdæd; ˈælɪˌdeɪd /
noun
- a surveying instrument used in plane-tabling for drawing lines of sight on a distant object and taking angular measurements
- the upper rotatable part of a theodolite, including the telescope and its attachments
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Word History and Origins
Origin of alidade1
1400–50; variant of alhidade < Medieval Latin alhidada < Arabic al-ʿiḍādah the turning radius (like a clock hand) of a circle; replacing late Middle English allydatha (< Old Spanish alhidada )
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Word History and Origins
Origin of alidade1
C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle
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Example Sentences
Field artillery required a precision instrument known as the miniature telescopic alidade of the Gale type.
From Project Gutenberg
A very simple alidade may be made by mounting two needles on a ruler.
From Project Gutenberg
Close by stood an alidade, an instrument for measuring angles.
From Project Gutenberg
After he had placed the plane table on a tripod and upon this the alidade, he started to work.
From Project Gutenberg
The alidade is a triangular ruler with one or more working scales on it beside other measurements.
From Project Gutenberg
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