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为了准确的测得浮标流经中断面的位置,我们在上下断面各安一架经纬仪同时瞄测,但从记录中许多点子看来,都是下仪器测的距离大于上仪器所测距离,一般大三公尺左右。后经讨论研究,发现是浮标走的很快,在中断面的同志从看见浮标到中断面到发出旗语或哨音须有一个时间,上下断面看仪器的人,从听到哨音到停止镜头转动,又须一个时间,因此上仪器读的角度偏小,下仪器偏大。为了避免这种误差,我们在对岸中断面以上两公尺立一花杆,在这岸设一垂球线,两者构成与断面线平行的方向(即在原断面
In order to accurately measure the position of the buoy passing through the discontinuity, we surveyed one theodolite at the same time in the upper and lower sections. However, from the point of view of many records, the distance measured by the instrument is greater than the distance measured by the instrument. About three meters in length. After discussing the study, it was found that the buoys went very fast. The comrades in the interception planes should have time to see the buoys and the whistles from the buoys to the interruption planes. The people who saw the instruments in the upper and lower sections saw the whistle to stop the camera Turn, but also a time, so read the angle of the instrument is too small, the next instrument is too large. In order to avoid such errors, we set a two-foot-long flower bar above the cross-section of the opposite bank and set a ball-down line on this bank, both of which form a direction parallel to the cross-section line