The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 50
ut-ting the sides of the square at 1, 2, 3, 4, 5, 6, 7 and 8 ; join 1and 2, 3 and 4, 5 and 6, &c., and the figure is completed. In order to eight-square a hand-rail, or any piece that is tobe afterwards rounded, draw the diagonals, a d and b c, uponthe end of it, after it has been squared-up.… … Fig. 58. 97.— Within a given circle to inscribe any regular polygon.Let a I c 2, (Fig. 58, 59 and 60,) be given circles. Draw thediameter, a c; upon this, erect an equi-lateral triangle, a e c,according to Art. 93; divide a c into as many equal parts asthe. polygon is to have sides, as at 1, 2, 3,…
Carpentry · Architecture
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