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 60
^v The German text, and all upright letters should be evenlybalanced on each side of an imaginary vertical centre line, inorder to give them the most satisfactory appearance. Ex. 112. The varieties of curves being innumerable, a few arehere annexed by way of suggestion. The student can devisemany… … The group of four parallel curves affords an excellent ex-ample for practice, each curve being nearly straight in the mid-dle, and sharply curved at the ends, while its left-hand halfis convex upwards, and its right-hand half equally so down-wards ; and each with a vertical tangent at its…
Geometrical drawing · Mechanical drawing
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