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 125
ngle, ABC,Fig. 5, is divided by its altitude CD into right angled trianglesof 30°, 60°, 90°, giving the ratios i, i, |, thus illustrating^ byits exhibition of the number 3, in connection with 2, the firsfiprinciple of varieti/. Ao sX &\^ S Go^ cX 39. The simplest geometric beauty of the third… … two ratios based on the number 5, illustrating the second prin-ciple of variety, the combination of uniformity with variety{Art. 18). It also, in the whole triangle, 36°, 72°, exhibitsthe ratio, ^. 92 FKEE-HAND GEOMETRICAL DRAWING. 40. Derived ratios. But from \k\Q, first example (Art. 37) \^the…
Geometrical drawing · Mechanical drawing
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