When you revolve a view perpendicular to the profile plane of projection, the
axis appears as a point. The size and shape of the side view remain the
same. The width of the object remains unchanged and you can transfer
distances with a scale or dividers.
Figure 3-49 shows a 45-degree revolution perpendicular to the profile plane.
Figure 3-49.A revolution 45 degrees to
the profile plane.
You can find the true length of any line easily by means of a revolution.
Figure 3-50 illustrates finding the true length of any line by revolution.
Figure 3-50.The true length of any line in a
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