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 153
at D. In Fisr. 23, the ancles at a and & CUEVILINEAE GEOMETRIC BEAUTT. OVALS. 117 have the same ratio as tlie parts of A O B, while in Fig. 24, theydo not. 80. Pairs of ovals. Notice^ further.! that whenever A O Bis divided unequally by OD, we can obtain two ovals fromthe same transformed… … Fig. ^6 81. Results of the variations.—1. The more acute the anglesat a and h, the longer, and more nearly pointed, the oval be-comes. 2°. The greater the difference between the angles at a and 5,the greater is the difference in the form of the two ends of theoval. 3°. But when the shorter segment…
Geometrical drawing · Mechanical drawing
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