1911 Encyclopædia Britannica/Alidade

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1911 Encyclopædia Britannica, Volume 1

Alidade

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10500591911 Encyclopædia Britannica, Volume 1 — Alidade

ALIDADE (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.