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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 131

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 131
P<^ IP, F.-^v <l. triangle^ of £0° and 120°, giving the ratios \ and ^. Thesquare, Fig. 11, divides into triangles of 45° and 90°, giving the GEOMETRIC BEAUTY OF POLTGONS. GEOMETEICAL DESIGN. 97 ratios -f and ^. The regular pentagon, Fig. 12, is composed oftriangles of 54° and 72°, giving the… … Ex. 5. In like manner note the angles and ratios afforded by the other reg-ular polygons, up to the dodecagon or polygon of twelve sides. 50. Proceeding with polygons, as before with rectangles, theonly equal and regular polygons which can combine withoutleaving unfilled spaces between them, are…

Geometrical drawing · Mechanical drawing

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