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为1981年第二期刊登的《用座标法测量圆弧》作一点补充。按图一所示进行座标变换更为简便。在测取A点座标为新标座系的原点(0,0)后,纵向移动测取圆弧另一点
For the second issue of 1981 “coordinate arc measurement method” for a little supplement. Coordinate transformation as shown in Figure 1 is easier. After taking the point A of the new coordinate system as the origin (0,0) of the new coordinate system and moving it vertically to measure the other point of the arc