ALHIDADE, or Alhidada, the Index or Label of an Astronomical, or Geometrical Instrument, for taking of Heights or Distances—The Alhidade is a kind of Ruler, movable on the Centre of the Instrument; and carrying the Sights. See INDEX, SIGHTS, &c. See also Astrolabe, THEODOLITE, etc. The Word is Arabic, where it signifies the same thing. —In Greek and Latin, it is called διόπτρα, Dioptra, and Linea Fiduciae, Fiducial Line.
ALHIDADE
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- Written by: Ephraïm Chambers
- Category: Unclassified