为了减少误差,浮标测量时开关秒表,应由中断面看浮标的同志掌握。这样不仅听看信号比较清楚,便于掌握,而且还可以消除声音传播的误差。以往我站在上断面开关秒表,时间的差误常在五到十五秒之 In order to reduce the error, when the float stopwatch switch measurement, the buoy should be interrupted by the comrades to see. This not only listen to the signal more clearly, easy to grasp, but also can eliminate the error of sound transmission. In the past I stood on the section switch stopwatch, the time difference often five to fifteen seconds