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 43
This figure is most easily constructed by first drawing itsdiagonals so that each shall be at right angles to the other at itsmiddle point, and by then joining their extremities. Let rhombuses of various proportions be drawn. A square may also be drawn by its diagonals in the same way. Ex. 80.… … ■ i; ► 0 O O—i k ik A. AK -A examples obviously require the divisions of lines into equal 30 FREE-HAND GEOMETRICAL DRAWING. parts. Also, in the second figure, the marking of equal dis-tances, viz., the semi-diagonals of the little squares. Ex. 81. Embraces a regular pentagon and some applicationsof…
Geometrical drawing · Mechanical drawing
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