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 45
equal parts by the shorterones, perpendicular to it, and the centre. Ex. 83. Divide a circle into eight equal parts, by diametersat 45° with each other, and join the points of division by straightlines, which will give a regular octagon^ or eight sided figure.This figure can also be drawm, by… … TT I I Ex. 85. Embraces oblique lines.
Geometrical drawing · Mechanical drawing
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