Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 98
4, in.from it. 345. Show the true form of thesection cut from the torus of Fig. 168 by the plane ^. Note.—This section is the Lemnisoate of Bernouilli. 346. A cone of revolution of vertex angle 60° with its vertex lying … Fig. 168.
Geometry, Descriptive
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