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 169
great beauty. But in turning fromNature to Geometry, we find no mention made of egg-formedcurves in ordinary treatises, while in the more extended workson the higher curves, we find them occasionally as detachedportions of curves having a complex law of construction, andwhich consist of two or more… … arcs, as in Fig. 20, where A D B is a semi-circle ; A E and B Gl-are arcs described from B and A, respectively as centres, C theintersection of their radii, being the centre of the arc E F G. 74. Hays composite ellipse.—Still, it is desirable, both forthe sake of conformity to Nature, and of…
Geometrical drawing · Mechanical drawing
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