The American house carpenter. A treatise on the art of building. Comprising styles of architecture, strength of materials, and the theory and practice of the construction of floors, framed girders, roof trusses, rolled-iron beams, tubular-iron girders, cast-iron girders, stairs, doors, windows, mouldings, and cornices; together with a compend of mathematics. A manual for the practical use of architects, carpenters, stair-builders, and others (1880)
Hatfield, R. G. (Robert Griffith), 1815-1879, Hatfield, O. P., ed · New York, J. Wiley & sons · leaf 400
equilateral octagon the semi-diagonal of a circumscribed square, having its sides coinci-dent with four of the sides of the octagon, equals the dis-tance along a side of the square from its corner to the moreremote angle of the octagon occurring on that side of thesquare. Let Fig. 263 represent the… … Fig. 263. octagon being equilateral, it is also equiangular, thereforethe angles B CO, E C O, A D O, etc., are all equal. Of theright-angled triangle FEC,FC and FE being equal, thetwo angles FE C ^nd ECE, :xrQ equal {Art. 338), and aretherefore {Aft. 347) each equal to half a right angle. In…
Carpentry · Architecture · Building
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
