Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 86
the line. Every complete ellipse has two foci and two directrices, as shown in the figure. Let A, E, D, and B be points in the curve; then the ratio referred to— focus to vertex CA CE CD CB ^ . .^ gjj = gji = eccentricity. vertex to directrix AF EG If this be understood, you will be able to easily… … Fig. 210.—Ellipse, as the locus of apoint.
Mechanical drawing · Geometrical drawing
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