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本刊81年第1期刊出“新型变形观测仪器——ISD 65大坝视准仪的研制”一文后,不少单位来人、来函要求进一步了解SD65大坝视准仪的结构及使用方法,今登载此文一并作答。
After the publication of “A New Deformation Observation Instrument - Development of the ISD 65 Dam Sight Sighting Apparatus”, many units came to us and asked for more information about the structure and usage of the SD65 dam sight sighting instrument. Today published this article together to answer.