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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 124

An illustration from 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, leaf 124
ave simple ratios to each other, founded on the num-bers 2, 3, 5. And, of these triangles, right angle ones are thesimplest in relation to our present subject, since they contain inthemselves the standard angle of comparison for the other twoangles. (26) Formal beauty, thus founded upon the numbers… … FiV.-f. which the equal acute angles are to each other as 1 : 1, and tothe right angle, as 1 : 2. Also this triangle can, as shown atA « 0 and a 5 B, be indefinitely divided into triangles similarto the whole one, ABC. It thus geometrically represents theprinciple of uniformity.. 38. The simplest…

Geometrical drawing · Mechanical drawing

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