Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 126
Fig. 93. No. 22.—To draw a perfect ellipse by means of the fociand intersecting arcs, axes being given. Kz … Fig. 94. Let the axes, AB and CD, be placed centrally, at rightangles to each other ; then measure from C the distance fromA to D, and describe arc cutting AB in F and F: these arethe foci. Between O and F, take any number of points, 1, 2,etc.—the more the better; then with centre F (left) and dis-…
Geometrical drawing · Perspective
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