Plot the altitude of the crossroads and other significant sites of the northern plateau with no other instrument but our stone mason's level. 在除了石制水平仪之外，没有其他仪器的情况下，测量出十字路口以及北部高原重要地点的海拔高度。
A surveying instrument consisting of a spirit level and a sighting tube,used to measure the angle of inclination of a line from the observer to the target. 由一个水平仪和一个观测管组成的测量工具，用来测量从观测者到目标的直线的倾斜角。
