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 145
finitely divided into triangles similarto the whole one, ABC. It thus geometrically represents theprinciple of uniformity.. 38. The simplest geometric beauty of the second order is APPLICATION TO TRIANGLES AND RECTANGLES. 01 that of the equilateral triangle. For such a triangle, ABC,Fig. 5, is… … 39. The simplest geometric beauty of the third order isthat of the isosceles triangle having an angle of 36° and two of72°, Fig. 6. For its altitude, CD, divides it into triangles of18°, 72°, 90°, which exhibit the ratios J, £, \, thus, by including c pi fvt £>0 A p R3-.6. two ratios based on…
Geometrical drawing · Mechanical drawing
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