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 88
Pig. 217.—Tangent and normal at fixedpoint in the ellipse. Pig. 218.- -Ellipse, given conjugatediameters. problem, and the foci F and Fo, as in Prob. 132. Then join the fixed point P to F and Po. Produce P.,P to G, and bisect the angle GPF by IJ. wliichis the required tangent. A very important…
Mechanical drawing · Geometrical drawing
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