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INTERSECTING RECTANGULAR PRISMS
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46. Related Mathematics on Elbows.—Solids of Revolution.—All elbows may be treated mathematically as solids of revolution.
Figs. 131-136.—Three-piece Rectangular Elbow.
Any surface moving about a fixed point will generate a solid of revolution. Suppose a piece of round rod is formed in the rolls to a true circular profile. A solid of revolution would be created
