English Dictionary

Definition of “alidade”

alidade (ˈælɪˌdeɪd ) or alidad (ˈælɪˌdæd )

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

C15: from French, from Medieval Latin allidada, from Arabic al-'idāda the revolving radius of a circle

This is usually called the alidade , and is on the back of the instrument.

North, John The Fontana history of Astronomy and Cosmology

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