过去进口经纬仪度盘损坏时,都要用原制造厂生产的度盘更换,而国外厂商一般不单独出售度盘,造成不少仪器因此而报废。该院自力更生,大胆地进行了光学经纬仪度盘试制工作,从1971年开始,在有关单位协助下,经过224次试验,终于1973年底用复印方法试制成功。经有关部门鉴定,精度符合要求,对挖掘现有测量仪器潜力,节约国家投资有重要意义。 In the past, when the imported theodolite dial was damaged, it must be replaced with the original manufacturer’s production dial, and foreign manufacturers generally do not sell the dial separately, causing many instruments to be scrapped. The Institute relied on its own efforts and boldly carried out trial production of optical theodolite dials. Since 1971, with the assistance of the relevant units, after 224 trials, it was finally successfully prototyped by the copying method at the end of 1973. Appraised by relevant departments, the accuracy meets the requirements, and it is of great significance to tap the potential of existing measuring instruments and save the country’s investment.