Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 214
eroid, perpendicular to H,and touching the right section at a and b. The points a andb are on the line of sight of the spheroid and a* and 6* arepoints on the H projections of the spheroid. Now let thespheroid be considered as a surface of transposition (§ 139),generated by a variable right… … Fig. 182 198 DESCRIPTIVE GEOMETRY [VIII, § 174 intersection of the envelope with H is a curve, tangent to thesuccessive projections of the right section, which determinesthe projection of the surface.
Geometry, Descriptive
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