Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 276
he intersection in this case consists of two separatecurves, symmetrically placed with respect to the plane M. It occasionally happens that the edge view of the givensecant plane is found to be tangent to one or both of thecircles lying in the meridian plane of symmetry. In thisevent, the plane is… … Fig. 315. Fig. 316. Fig. 317. the curve crosses itself at an angle. According to whetherthe plane does or does not intersect the second circle lyingin the meridian plane of symmetry, the resulting projectionresembles Fig. 315 or 316, respectively. Each of these formsis considered a single curve. If…
Geometry, Descriptive
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