A simple and convenient method of drawing indicates oblique plane, direction of projection, is given in this paper, making it more simple and direct as well as speedy to chart.
给出了双斜平面的一种简便的图示方法——“斜投影法”，使作图更加简捷、迅速。
2
The projection of the special points on the intersection line of cylinder with oblique cylinder , of cone with half sphere and of oblique cylinder with cone are determined with the analytic method.