alidade
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
See alidade in American Heritage Dictionary 4
(ălˈĭ-dādˌ) also al·i·dad (-dădˌ)
noun- An indicator or a sighting apparatus on a plane table, used in angular measurement.
- A topographic surveying and mapping instrument used for determining directions, consisting of a telescope and attached parts.
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