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 62
is, tomake the other side of exactly the same form, but in a reversedposition. This can be done, as in thefigure, by drawing lines perpendicularto the centre line, and by marking onthem equal distances on eacli side ofthe centre line. The following areother examples of symmetrical figures,some of… … CURVES AND CURVED OBJECTS IN GENERAL. 45
Geometrical drawing · Mechanical drawing
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