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 168
by some other simple surface. Thus, acone is formed by revolving a right-angled triangle abouteither of the sides of the right angle; and the curves whicharise by cutting its curved surface by any plane are naturalcurves. 69. An artificial curve, on the contrary, is built up of sepa-rate arcs, of… … 71. The artificial ellipse may be composed in various waysof four or more circular arcs, one way being shown in Fig. 19, CURVILINEAR GEOMETRIC BEAUTY. OVALS. Ill where C, O, P, Q, are the centres of the two pairs of arcs, asab, and be, there used. But the resulting figures are all moreor less…
Geometrical drawing · Mechanical drawing
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