探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。

This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of plane trace and geometrical drawing method.

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对过椭圆外一定点的法线作图问题作了探讨，指出了几何作图法的不可解性。

This paper discusses the graphic problem of ellipse normal through a point outside the ellipse. Concluded are the unsolvability of geometric graphic method to solve this problem .

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本文从互为对偶的电网络的线图矩阵间关系的分析，得出求作对偶电网络的矩阵法。它异于常用的几何作图法。

After analyzing the relations between graph matrices of dual electrical network a method of plotting the latter which is different from usual geometrically drawing method is presented in this paper.

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