f. * Lines*. The projection of lines between views follows directly from the point

projection theory. If we consider the axiom:

It follows then that lines may be projected by projecting the points that define

them.

Figure 9 presents the problem of finding a right side view when the front and top

views are given.

FIGURE 9.

LINE PROJECTION PROBLEM.

Figure 10 (on the following page) is the solution and was arrived at by the

following:

Step 1.

Projecting point 1 into the right side view.

Step 2.

Projecting point 2 into the right side view.

Step 3.

Connecting points 1 and 2 with an object line.

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