勘探网或勘探線描繪的正确与否,对勘探工程的佈置和檢查,特別是对剖面图的切制影响很大。过去一般描繪勘探線是用三角板或三角板配合直線尺推平行線,有的是按座标展点。前一种方法因为图紙底板和图紙的收縮,图上兩点间按座标求得的距离往往不等于直线尺量得的,如按此继续推下去,因在推动三 The correctness of the exploration network or exploration line mapping has great influence on the layout and inspection of exploration projects, especially the cutting of profiles. In the past, the general drawing exploration line is to use a triangular plate or triangular plate with a linear ruler to push parallel lines, some according to the coordinate point. The former method because of the contraction of the drawing board and drawings, the distance between the two points according to the coordinates of the drawing is often not equal to the amount of linear ruler, such as pushing down according to this, because in promoting the three