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用不同焦距的航摄资料在B(8s)上测图，要更换与其相应的主距架，过去更换主距架时，要用人抬镜箱体，既费人力又不安全。为了适应生产的需要，我们利用旧转椅的螺杆和螺母，制成了一个镜箱体支架，用以代替人抬镜箱体，
With different focal lengths of aerial photogrammetry in the B (8s) mapping, to replace its corresponding main distance frame, in the past to replace the main distance frame, it is necessary to lift the mirror box, both manpower and insecurity. In order to meet the production needs, we use the old swivel chair screw and nut, made of a mirror box bracket, instead of people carrying the mirror box,