为解决夜間浮标测流传递信号的困难,我們架設了三线通訊线路(詳見附图),經汛期使用証明,这种設备传递信号效果良好,茲将使用方法介紹如下: 当浮标經过上断面时,将A处开关合上,此时上、中、下断面三处的指示灯齐明,中断面处的同志作准备,下断面(經緯仪处)同志立即开动秒表,之 In order to solve the difficulty of signal transmission at night buoys, we have erected a three-wire communication line (see the attached figure). After the flood season proved to be effective, the signals transmitted by the devices are good. The method to be used is as follows: Cross-section, the switch will be closed at A, at this time, the middle and lower sections of the three lights Qi Ming, the comrades at the fracture surface preparation, the next section (theodolite Department) comrades immediately start the stopwatch,