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 137
AB remainsof fixed length. Pins being fixed at F and F, and a firm CTTEVILINEAB GEOMETRIC BEAUTY. 103 thread of the length PFFP being placed around them, and apencil point at P, this point, moved so as to keep the stringstretched, will trace the ellipse. CD, perpendicular to AB atits middle point,… … 10 r / is divided into four equal parts. Lines parallel to adjacentsides of the square, through these points of division, divide thearea of the square into sixteen equal square parts, as the peri-meter is already divided into sixteen linear parts. If, now, a circle he inscribed in this square, the…
Geometrical drawing · Mechanical drawing
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