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 181
c.Likewise the eye is the best instrument for testing the beauty * The advanced student, if acquainted with Descriptive Geometry, willrecognize the surface from which these ovals are cut as a right conoid, whosedirectrices are the semi-circle ACB, and a vertical at O, equal to AC, andwhose elements… … ( I KVILINEAR GEOMETRIC BEAUTY. OVALS. 121 of compound forms, made by combining separately pleasingelementary forms. Moreover, as we have seen, very many ovals can inscribe thesame harmonic triangle. Thus, in various ways, it is evident,that, in the higher forms of curvilinear beauty, we…
Geometrical drawing · Mechanical drawing
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