一种便携式观测仪器，主要包括安放在三脚架上的绘图板和一把直尺，用于观测和绘制地形详图。
A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details.
一种便携式观测仪器，主要包括安放在三脚架上的绘图板和一把直尺，用于观测和绘制地形详图。
A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details.
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