Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 90
and, therefore, one lineof the tangent plane. If a second line, ck^ bedrawn through point d, and tangent to anysection of the cone containing this point, itwill be a second line of the tangent plane.The traces of these lines will determine ^aSand VS^ the traces of the required tangentplane. If the… … 105. One projection of a point on a single-curved surface being given, it is required topass a plane tangent to the surface at the ele-ment containing the given point. Principle. The tangent plane will be de-termined by two intersecting lines, one ofwhich is the element of the surface on whichthe…
Geometry, Descriptive
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