Bible Encyclopedias
Alidade
1911 Encyclopedia Britannica
(from the Arab.), the movable index of a graduated arc, used in the measurement of angles. The word is used also to designate the supporting frame or arms carrying the microscopes or verniers of a graduated circle.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Alidade'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/alidade.html. 1910.