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测设公路回头曲线有多种方法,如:发针形曲线延长两反向弯道之导线求圆心及在回头曲线起止点前后测辅助内角求圆心等方法。这些方法,各有所长,但因必须要丈量辅助线距离及观测有关角虔,所以要作一些必要的计算,费时不少。兹就个人在实际工作中的点滴体会,制成一个角度板,名曰“选点照准板”。今将它的构造使用和测设方法介
There are many ways to measure the curve of turning back to the highway, such as: the needle-shaped curve to extend the two reverse curve of the line to find the center of the circle and in the back and forth before and after the curve start and stop to find the auxiliary angle to find the center of the circle and so on. These methods have their own advantages and disadvantages. However, it is time-consuming to make some necessary calculations because of the need to measure the distance between auxiliary lines and to observe the situation. This is a personal experience in the actual work of bit by bit, made a point of view of the plate, the name “election point camera board.” This will be its construction and measurement methods used