surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles 同义词：alidad,
surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments 同义词：alidad,
An alidade (archaic forms include alhidade, alhidad, alidad) or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to draw a line on a plane table in the direction of the object or to measure the angle to the object from some reference point.
例句与用法
1.
The test of dj6 theodolite eccentricity of alidade 6型经纬仪照准部偏心差的检验
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