Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 96
line may bedrawn tangent to the meridian at this point,its projections being A\, A^ Counter-revolvethis meridian plane to determine the true posi-tion of the tangent line, shown by its projec-tions at A\ A^. The traces of the tangentlines A and B will determine the traces of therequired tangent… … the given point. 2. Pass a plane tangentto the auxiliary cone at the element drawnthrough the given point (Art. 105, I3age 73). Construction. Fig. 156. A^ and J.^ arethe projections of the element of a cone tan-gent to the ellipsoid and containing point e.A plane tangent to the cone at line A will…
Geometry, Descriptive
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