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 39
hence the angles they subtend, d h a and dh c, are equal. So likewise chords drawn from a tof and from/ to d, are equal, and subtend the equal angles, dhf and fh a. Additional points, hey and a or h, may be obtained on the same principle. To obtain a point beyond a, on h, as a centre, describe with… … 87.—T<9 describe a segment of a circle hy a set-triangle. Leta 5, (Fig. 46,) be the chord, and c d the height of the segment.Secure two straight-edges, or rulers, in the position, c e and cf,by nailing them together at c, and affixing a brace from e to// put in pins at a and h / move the angular…
Carpentry · Architecture
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