Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing (1878)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York, J. Wiley & sons · leaf 60
ellipse is inscribed in a rectangle, it crosses the cen-tre lines of the rectangle at right angles, at the points of tan-gency with the sides of the rectangle. Thus the eight guidingpositions afforded by the rhombus, are reduced by union to four,in the rectangle. The ellipse will, however, cross… … An ellipse is a curve of most delicate grace, and should there-fore be most faithfully studied and carefully drawn. The mostoffensive error in shaping it, is, to represent it as pointed at thenarrow end, which it is not, in the least. By combining elliptical arcs of various proportions, tangent…
Geometrical drawing · Mechanical drawing
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