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 57
line at the base. The up-per side-rhombus, with its angle of 18*^,side of one in the central rhombus of60% gives the comparatively complexand unfamiliar ratio -j^. Also its righthand corner is arbitrarily located on a horizontal line through the upper vertex of the central rhombus.In both of these… … 40 FBEE-HAKD GEOMETRICAL DKAWING. rhombuses, having a diagonal in common, the beautiful eggshaped curve will be formed, thus:
Geometrical drawing · Mechanical drawing
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