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 186
ne, measured perpendicularly from points at given distanceapart on a fixed straight line of reference, as ah in Fig. 31. cp^/ ***& a 6 F% * 31. But in applying this method to the free design of some idealline of beauty, we are no longer bound by given distances eitheron, or from ab, but can,…
Geometrical drawing · Mechanical drawing
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