The American house-carpenter; a treatise upon architecture, cornices and mouldings, framing, doors, windows, and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 45
91.—About a given circle, to describe an equi-lateral tri-angle. Let a d b c, (Fig. 51,) be the given circle. Draw thediameter, c d ; upon c?, with the radius of the given circle, de-scribe the arc, a e b ; join a and 6 ; draw f g, at right angles tod c ; make/c and c g, each equal to a b ; from/,… … 92.— To find 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. 96 ; draw gf, parallel to a c ; extend e c to/,also e ato g ; then gf will be nearly the length…
Carpentry · Architecture
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