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 27
Ex. 45. Draw lines in several directions through the samepoint, and mark equal distances from the point on all of them;thus: … 14 FREE-HAND GEOMETRICAL DRAWING. Division of Lines into Equal Parts. Ex. 46. Divide lines in various positions, as shown below, intctwo equal parts. This is done by marking the middle point ofthe line, and is called bisecting the line. Then apply the papermeasure, and see if the two parts are…
Geometrical drawing · Mechanical drawing
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