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 81
ls the radius, minus the square root of the difference ofthe squares on the radius and half-chord. The rule expressedalgebraically is v=r--Vr^—a^ where v is the versed sine, r theradius, and a the half-chord. It is read, v equals r, minus thesquare root of the difference of the squares of r and a.… … Fig. 110. a Side of the square from its corner to the more remote angleof the octagon occurring on that side of the square. To provethis, it need only to be shown that the triangle, a o d^ {Fig.110,) is an isosceles triangle having its sides a o and a d^ equal.The octagon being equi-lateral, it is…
Carpentry · Architecture
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