Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 234
Fig. 298. XX, §171] SURFACES OF REVOLUTION 213 another line, but the relative positions of the lines A and JVare such in this case that it may be done. Construction (Fig. 299). Let A be the given line, and o thecenter of the given sphere. Find the plane, X, which con-tains o and is perpendicular to… … Fm. 299. plane X is oblique to both // and V, the great circle in whichX intersects the sphere will project as an ellipse in each new.To avoid drawing these ellipses, revolve the plane X aboutone of its traces into // or V (§ L38). Lei X be revolvedabout HX into H. Tin; point c revolves bo c,…
Geometry, Descriptive
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