利用激光光束定向原理制成的指示井巷、隧道施工方向的仪器，分为巷道指向仪和激光投点仪两种。激光指向仪由激光器、光学系统、电源和安装调整机构几个部分组成。
用激光指向仪指示巷道掘砌工作的方向和坡度。
Setting-out of driving workings direction by laser guide instrument;
本文主要叙述了国产激光指向仪在地下斜巷掘进中的安装、调试以及使用激光指向仪的优点和注意事项。
The installing and debug of the domestic laser director in underground oblique opening excavation are mentioned. The merit and notice of using laser director is mentioned too.
介绍了用一种简易激光指向器改装经纬仪，使普通经纬仪带有激光指向器。
An improved theodolite fixed with a simple laser direction indicator was introduced.
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