Alidade

[ælideid]

解释:

(noun.) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles.

(noun.) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments.

校对:诺艾尔--From WordNet

解释:

(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

编辑:基蒂