Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 236
eter-mine the tangent plane by means of the normal. Through oTdraw Nr perpendicular to FT. The line N lies in the plane X XX, § 171] SURFACES OF REVOLUTION 215 (see the Analysis); hence the intersection of Nr and HX is the//-trace of N. Using this trace and the point o, determine theprojections,… … Fig. 300. Special Case. Tlie given line is parallel to H or V. Let thegiven line A, Fig. 300, be parallel to 77. Assume a secondaryground line, 0\L\, perpendicular to Ah. The line A will thenproject as a point, A? (§ 70). Project the center of the sphereto of, and draw the sphere. The edge views,…
Geometry, Descriptive
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