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。

youdao

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。

youdao