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测地形人工跑尺、爬高山、越深涧,既劳累又不安全,改变这种落后的测量方法是勘测人员长期以来的迫切愿望。铁道部第三设计院广大职工自1958年以来,在党的社会主义建设总路线的指引下,多次提出研制无标尺测距仪的课题,到1972年的14年间,先后经过了四次较大的设计、试制阶段,创制了盲距分划极及同步异向双光契测微计,解决了近距离观测及测角偏心差,使测绘上应用无标尺测距仪,由变基线型过渡到定基线
It is laborious and insecure to measure artificial terraforming footprints, climb mountains and deeper streams, and changing such backward measurement methods has long been an urgent aspiration of surveyors. Since 1958, under the guidance of the general line of socialist construction of the party, many workers and staff members of the Third Design Institute of the Ministry of Railways have repeatedly raised the issue of developing a gauge-less distance measuring instrument. By the 14 years in 1972, Design, trial stage, created a blind sub-division pole and synchronous differential double-light micrometer to solve the short-range observation and angle measurement eccentricity, so that the application of non-scale surveying and mapping range finder from the base line transition To set the baseline