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
e angles of their enclosing rhombuses should form simpleratios. Moreover, these rhombuses should be in simple relativepositions, and the corresponding angles in the different onesshould form simple ratios. Ex. 105. In this design for a vase, all the angles, some of whosedeo-rees are given in the… … vertices in common. The acute rim-rhombus has its sides perpendicular to a 54 and h 72, its right side passes through the corner 72, and its diagonal passes through c, the junction of two arcs, and centre of a 72. Moreover, the diagonal 72-36 coincides with 18-72 produced, and the side 72- 54 is…
Geometrical drawing · Mechanical drawing
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