Mechanical drawing. Elementary and advanced (1910)
Reid, John S. (John Simpson), 1856- · New York, J. Wiley & sons; [etc, etc.] · leaf 68
Fig. 92. Fig. 93. F%.b 9§i An Arched Window Opening.—The curvesare all arcs of circles, drawn from the three points of the equi-lateral triangle, as shown in the figure. Firsb*94: To Describe the Trefoil.— The equi-lateral triangle is drawn first, and the angle 1,2,3 bisected bythe line 2, 4, which…
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