电子经纬仪是目前应用较为广泛的角度测量仪器，按其角度测量原理可分为增量计数法和绝对编码法。
At present electronic theodolite has been used widely in Angle measuring, according to the Angle measuring principle can be divided into incremental counting method and absolute coding method.
建立测量仪器之间相对角度测量用的长的光学参考基准，是光学工程中的一种特殊应用。
It is a special application to establish a long optical reference for measuring relative Angle between measurement instruments in optical engineering.
利用圆锥三角形边长的几何关系来确定转动角度，可以不用测量仪器加工出圆锥体。
Geometrical relationship among the length of triangle sides is used to determine the Angle of rotation, the cone can be machined without using measuring instrument.
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