al·i·dade /ˈæləˌded/
指方規,照准儀
Al·i·dade n. 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
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alidade
n 1: surveying instrument consisting of the upper movable part of
a theodolite including the telescope and its attachments
[syn: alidad]
2: surveying instrument used with a plane table for drawing
lines of sight on a distant object and for measuring
angles [syn: alidad]