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3. 4. VERTICAL AND HORIZONTAL TRACES OF PLANES The traces of a plane are the intersections it makes with the vertical and horizontal planes, or if the plane is not in contact with them, the lines it would make if it were extended towards the two planes (see figures 154, 155). Given the traces of a plane it is possible to develop its inclination to the vertical plane and also to the horizontal plane. Figure 154 shows the traces of a plane. V - T is the vertical trace and H - T is its horizontal trace.

Vation Qf intersection inclination of intersection v Figure 156 T A glance at the pictorial view of the two planes (figure 157) will help the reader to understand the situation of the two planes. 1. Figure 154 H" Figure 155 Draw the vertical trace at the required angle and then draw the horizontal traces. (To draw H' - T', draw a - b at any point and then make angle a - c - b 60°. With centre a and radius a - c describe an arc as seen in the drawing. ) Inclined and oblique surfaces 2. 3. Where the two vertical traces meet, at x, and where the two horizontal traces meet, at y, will give the plan and elevation of the intersection of the two planes.

Project lines from all the points on the elevation of the open mitre of moulding B at the true angle of inclination and construct the shape of moulding B as seen to the left of the drawing. a b MOULDINGS PASSING ROUND A PROJECTION open mitrt? In elevatIon Figure 145 shows three mouldings, A, Band C all inclined so as to appear in a straight line when viewed from the front. Mouldings A and C are inclined at the same angle as one another, the inclination of B has to be developed. The lines a - b and a' - b' show how the mouldings would appear when viewed from the front.

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