The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 45
32 AMEKICAN HOrSE-CAErEXTEE. 91.—About a given circle, to describe an equi-lateral tri-angle. Let a db c, {Fig, 51,) be the given circle. Draw thediameter, c d; upon d, with the radius of the given circle,describe the arc, aeb; join a and b; draw/g, at right anglesto d c ; make/* c and c g, each… … 92.—To fold a right line nearly equal to the circumferenceof a circle. Let abed, {Fig. 52,) be the given circle. Drawthe diameter, a c ; on this erect an equi-lateral triangle, a e c,according to Art. 93; draw g f parallel to a c ; extend e c to/ also e a to g; then g f will be nearly the length of…
Carpentry · Architecture
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