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 82
difference of thesquares of the radius and half-chord. That is, the versed sine,a c, (Fig. 109,) equals a J, less c b. Now a b is radius, hencethe radius, minus c 5, equals a c, the versed sine. To find thevalue of G &, it will be observed that c b is the side of tlie square,cf, while the… … Fig 109. triangle, I c <?, and the square, I A, is therefore equal to the twosquares, o e and c /, (Art. 157;) therefore, the square, c f, isequal to the square, I A, minus the, square, c e —or, is equal tothe difference of the squares on I d and c d. Consequently thesquare root of cf is…
Carpentry · Architecture
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