n. 照准仪, 森林火灾测位仪

[化] 照准仪

Alidade \Al"i*dade\, n. [LL. alidada, alhidada, fr. Ar.
al-'id[=a]da a sort of rule: cf. F. alidade.]
The portion of a graduated instrument, as a quadrant or
astrolabe, carrying the sights or telescope, and showing the
degrees cut off on the arc of the instrument --Whewell.