Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 715
tersections /6, e 5, « 2, ^ 1, 6^ 3, c 4, with the parallels ; havingthus the major and minor axes, construct the ellipse bj the trammel, or, sincethe curve is tangent at the centre of the sides, we have eight points in thecurve; it may be put in by curves or by the hand. To divide the… … Fig. 1775. ISOMETRICAL DRAWING. 699 required, and draw through the divisions radii from D meeting A B ; thenfrom the isometric centre of the circle draw radii from the divisions on A B,cutting the circumference in the points required. Second method: On the major axis of the ellipse describe a…
Mechanical drawing
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