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 176
s … v _AI\ Ns I \ \ I \ x Fig-.n- s\ K CURVILINEAR GEOMETRIC BEAUTY. OVALS. 119 base ah, Figs. 29, 30, of the transformed triangle, must beshorter than the greatest width, 2 O C, or 2 S e, of the oval.The axis, ax bu of the oval, being thus brought nearer to O, the
Geometrical drawing · Mechanical drawing
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