论文部分内容阅读
[一]在切线上量距:例图1。①求出欲求方向点 K 与 Bc 的距离 L,根据已知半径和 L 从曲线表查得 K 点的总偏角α,并求出 2α之值。②根据2α和 R 查得切线长 T＇。③从 Bc 点沿切线方向量得 T＇
[A] in the tangential distance: Example Figure 1. ① Find the desired direction of the distance between the point K and Bc L, according to the known radius and L from the curve table to find the total point of K-angle α, and find the value of 2α. ② According to 2α and R tangential tangent length T ’. ③ from the Bc point tangential direction along the amount of T ’