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 173
o of the angles, a and b, of the trans-formed triangle a Ob, either the same as, or different from thatof the two angles into which A O B is divided. 3°. By making the transformed triangle aOb(oraS b—seeArt. 79) right angled, or not, at O. 79. Illustrations. Of Figs. 23 to 30, inclusive, each ill… … 116 FREE-HAND GEOMETRICAL DRAWING. trates one or more of these variations. Similar points havingthe same letters on all of them, and the construction of allbeing the same, with one exception, next mentioned, repeateddescription is unnecessary. But note, that when the angle A O B is divided…
Geometrical drawing · Mechanical drawing
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