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 161
by Hay in an appendix, and by the methods of analytical geo-metry, suited therefore only to advanced students, are here given arithmeti-cally in a way suited to pupils acquainted with the elements of geometry- CURVILINEAR GEOMETRIC BEAUTY. 107 from 10 and 9 in space, to the paper, will be parallel,… … id n Then we evidently have b 10 : ¥ 10:: d 9: c 9. That is,see Figs. 15, 16, the ordinate b 10 of an ellipse, is to the cor-responding ordinate, b 10, of the circle described on the longeraxis of the ellipse as a diameter, as the semi-conjugate axis,c9, of the ellipse, is to its semi-transverse…
Geometrical drawing · Mechanical drawing
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