Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 40
t hnes, forming the triangle, a c h ; bisect the angle, cb a, {Art. 77,) with the line, b d ; also bisect c a in e, and erect e d, perpendicular to a c, cutting b dm. d ; then d is the fourth point required. A fifth point may be found, as at/, by assilming a, d and 6,as the three given points, and… … 87.— To describe a segment of a circle by a sei-triangle.Let a b, {Fig. 46,) be the chord, and c d the height of the seg-ment. Secure two straight-edges, or rulers, in the position, c eand cf by nailing them together at c, and affixing a brace frome to/; put in pins at a and b ; move the angular…
Carpentry · Architecture
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