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 176
he difference in the form of the two ends of theoval. 3°. But when the shorter segment be of the base ah is in-scribed in the larger of the two unequal angles into whichAOB may be divided, the more unequal these angles, themore acute is the oval at the end at the acute angle, and obtuseat the… … Flg.*7. j*
Geometrical drawing · Mechanical drawing
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