Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thomas H. [from old catalog] · Toronto, W. Briggs; · leaf 128
N M Fig. 93. No, 22,—To draw a perfect ellipse by means of the fociand intersecting arcs, axes being given. … ^^^ 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…
Geometrical drawing · Perspective
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