An indicator or a sighting apparatus on a plane table, used in angular measurement.

旋标装置飞机控制板上的指示器或观测仪，用来测量角度。

youdao

The marble table seats for the purpose: the high precision parts parallel, plane measurement.

大理石表座的用途：对精密零件的平行，平面测量。

youdao

The theoretical part of the seminar on the measurement technology including the principle of a measurement survey, a plane-table method, a perpendicular survey, a traverse survey, a GPS survey, and using a total station will be conducted at the premises of the Institute of Fine Arts.

UNESCO: 7-8 November 2012, Tashkent, Uzbekistan