Vertical Collimator

an optical geodetic instrument used to construct a plumb line at a given point and to shift the point up and down. It consists of a straight or sectioned short-focus telescope, whose line of sight is leveled by means of three elevating screws on the support. A vertical collimator can be a self-sufficient instrument, but it is often built into other geodetic instruments and used to center the instrument above a given point. In such cases it is called an optical plumb.

单词	vertical collimator
释义	Vertical Collimator Vertical Collimator an optical geodetic instrument used to construct a plumb line at a given point and to shift the point up and down. It consists of a straight or sectioned short-focus telescope, whose line of sight is leveled by means of three elevating screws on the support. A vertical collimator can be a self-sufficient instrument, but it is often built into other geodetic instruments and used to center the instrument above a given point. In such cases it is called an optical plumb.
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