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 154
\ I \ \3/ V F.g.^7. - X y /jt—^v—Y^ … Flo-.^aVl CUEYILmEAE GEOMETRIC BEATJTT. OVALS. 119 base db^ Figs. 29, 30, of the transformed triangle, must beshorter than the greatest width, 2 O C, or 2 S (g, of the oval.The axis, Ox Ji, of the oval, being thns brought nearer to O, the
Geometrical drawing · Mechanical drawing
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