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 90
he difference of thesquares of the radius and abscissa, less the difference of theradius and versed sine. This may be expressed algebraicallythus : y = ^/rt — a? — (r — v), where y is the ordinate, r theradius, x the abscissa, and v the versed sine ;—d n being theabscissa of the ordinate nm^dg the… … Fig. 118. 167.—Proposition. The sides of any quadrangle beingbisected, and lines drawn joining the points of bisection in theadjacent sides, these lines will form a parallelogram. Drawthe diagonals, a 5 and c d, (Fig. 118.) It will here be per-ceived that the two triangles, a e o and a c d, are…
Carpentry · Architecture
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