ABSTRACT
When a line passes through a plane, the point of intersection is called a ‘ trace ’ . When a plane passes through another plane, the line of intersection is also called
a ‘ trace ’ .
The projection of a line that is not parallel to any of the principal planes. Figure 13.1 shows a straight line AB suspended between the three principal
planes. Projectors from A and B, perpendicular to the planes, give the projection of AB on each of the principal planes. On the right of Fig. 13.1 can be seen the projections of the line after rabatment.
