It consists of a base (the alidade) on which a sight is mounted. When this is horizontal, its axis is parallel to the base.
在(照准仪)基座上水平且与台基座平行地装有一镜。
A flat drawing board mounted on a tripod used in combination with an alidade to construct topographic or geologic maps in the field.
一块安装在一个三脚架上的平坦画板，与照准仪一起用于在野外测制地形图或地质图。
A flat drawing board mounted on a tripod used in combination with an alidade to construct topographic or geologic maps in the field.
一块安装在一个三脚架上的平坦画板，与照准仪一起用于在野外测制地形图或地质图。
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