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精密水准路线经过60～100M宽的河流时,就需要采用双转点过河。因观测开始後就不能改变远尺焦距,仪器与尺子的位置都必须在观测之前确定。为了减少定位的时间,我们的定位法是比较简单的。如图Ⅰ、Ⅱ、Ⅱ′、代表测站点A、B代表尺台点,在定位前,可使前视水准尺至对岸,预先决定A、B、Ⅰ三点,在确定Ⅱ点时,可分两个步骤进行:①置水准仪于Ⅰ点,水准尺于B点,视距ⅠB ;②置水准仪于A点,BⅡ可用皮尺决定使等于ⅠA,AⅡ或AⅡ′,可用视距决定使等于ⅠB,这样Ⅱ或
Precision leveling route After 60 ~ 100M wide river, you need to use double turn point across the river. Since the observation can not be changed after the beginning of the far foot focal length, instrument and ruler position must be determined before observation. In order to reduce the positioning time, our positioning method is relatively simple. As shown in Figure I, II, II ’, on behalf of the site A, B on behalf of the platform point, before positioning, the front sight leveling ruler can be to the other side, predetermined A, B, Ⅰ three points, Divided into two steps: ① set the level at the point I, level ruler in the B point, line of sight Ⅰ B; ② set the level at A point, B Ⅱ can be determined by tape measure equal to Ⅰ A, A Ⅱ or A Ⅱ ’ , So Ⅱ or