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贵刊1990年第4期刊登了朱任华同志写的《经纬仪侧面观测弧垂的方法》一文,来自实践很值得学习。我在原理和观测方法上再补充几点,使其方法更加完善(以下简称《经纬仪侧面观测弧垂的方法》为“朱文”)。
Quarterly in 1990 published the fourth issue of Comrade Zhu Renhua “Theodolite lateral observation arc sag” article, from practice is worth learning. I added a few more points on the principle and the observation method to make it more perfect (hereinafter referred to as “Theodolite lateral observation arc sag” as “Zhu Wen”).