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在光学经纬仪上采用竖盘指标自动归零装置后,测量高角时就不必在每次读数时精细调平水泡,这样给测量带来了很大方便,提高了测量效率也减少了一次出现人差的可能。深受测量界的欢迎,代表了经纬仪发展的一个方向。类似结构最初是在水准仪上实现的,一般统称为测量仪器的自动水准基准或自动安平。
The optical theodolite with vertical index auto-zero device, the measurement of high-angle do not have to fine-tune the blisters on each reading, which brings great convenience to the measurement, increased measurement efficiency also reduces the occurrence of a human difference Possible. Welcomed by the measurement community, representing the development of theodolite in one direction. Similar structures were originally implemented on the level, generally referred to as the automatic level of the measuring instrument or automatic Anping.