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 49
The figures of interlacing lines are best made by sketchingthe whole in very faint, and lonbroken lines, at first; after whichthose portions of each line, which are meant to be visible, canbe retraced in firm and heavy strokes. IXk I … ■ ~.y, ; \ „ . , ;
Geometrical drawing · Mechanical drawing
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