假想柱面法

Hypothesis Cylindrical Surface Method

给出了能不作椭圆而求出截交线为两椭圆时的交点、椭圆和圆的交点、椭圆和直线的交点的方法，并且研究出一种假想柱面法，解决了在不能回避椭圆截交线时求曲面立体相贯线的问题。

The paper proposes a method of finding the intersection point with the intersection line being two ellipses concerned, the intersection point of a circle and an ellipse, and the point of the ellipse and a straight line when no ellipse is to be drawn. Besides, the paper presents one method, i.e, hypothesis cylindrical surface. By means of this method, the stereointerrelated line of the curve surface can be found, in case the elliptic intersection line can not be avoided.