Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 128
to obtain pointsin the vertical projection of the curve of inter-section, Ti, m, r, and s, thereby determiningpoint 0, the intersection of the directrix B withthe auxiliary cone. This point must lie onthe auxiliary cone since it lies on the curveof intersection between the cylinder and cone;hence,… … Fig, 181. C\ doj is, therefore, the required element ofthe warped surface. 146. Having given two curvilinear directricesand a plane director, to draw an element of thewarped surface. Case 1. In which the element is requiredto be drawn through a given point on one ofthe directrices. Principle. If a…
Geometry, Descriptive
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