alidade

alidade Definition

ali·dade (al′i dād′)

noun

a part of an optical or surveying instrument, consisting of the vernier, indicator, etc.
a surveying instrument consisting of a telescope mounted on a rule, used in topography

Etymology: Fr < Sp alidada < Ar al ʿiḍāda, two sides or sideposts < ʿaḍud, upper arm

alidade Usage Examples

Converse of object

pivot: A circular plate ' made much like the backe parte of an Astrolabe ' with a pivoted alidade, the sights.

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