Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 201
rboloid of revolution, which may bedefined as a surface generated by a straight line, revolving aboutanother line not in its own plane. Since these three are the onlypossible cases of revolution of a straight line, and since two ofthem give developable surfaces, it is evident that the hyperboloidof… … FiQ. 175 VIII, § 162] CURVED SURFACES 185 ■s The more common arrangements -of the directrices are asfollows: (1) three lines, either straight or cmved, or straightand curved lines in combination; or (2) two lines either straightor curved, or straight and curved lines in combination, anda plane…
Geometry, Descriptive
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