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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 165

An illustration from 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, leaf 165
But if the side, OA, of the right angle, be taken as such radius, as indicatedby the arc Aa, the other side, AB, will be the natural tangent of the sameangle. ft PLXI. … C A :^ c -7 F EH > A F.g.3.

Geometrical drawing · Mechanical drawing

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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