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Figure 7.22
7.5.2 INTERSECTIONS OF SPHERE AND ELEMENTARY SURFACES
Before beginning to consider cutting-sphere method it is well also to pay attention to
intersections of sphere and elementary surfaces.
If centre O of the sphere Φ is not located on the axis of the surface of revolution, intersection
must be constructed as intersection of two surfaces of revolution (Fig. 7.22 and Fig. 7.23).
Figure 7.23
Intersection of sphere and pyramidal or prismatic surface is a curve composed from circular
arcs, which are intersections of sphere by separate faces of these surfaces (Fig. 7.24).
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