圆锥与球正交相贯线上特殊点的确定方法

Method of Deciding Special Point on Vertical Intersecting Linebetween Cone and Sphere

从解析法出发，总结了圆锥与球正交时，其相贯线上的特殊点所处位置的图解规律。

A new graphic method was found to decide the special point on vertical intersecting line between cone and sphere by means of analytic geometry This method can posi tion accurately the intersecting line It possesses high theoretical and prachical value both in research of drawing geometry technique and lofting and drafting in sheet metal work