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 503
Or: The area oi a regular Jiecadccagon equals eight timesthe square of its side^ multiplied by the square root of two quan-tities, one of which is the square root of 2 added to if, and theother is the square root of the stem of seven halves of the squareroot of 2 added to 5. 439.—Polygons ^ Radius… … upon geometrical proportions. This relation in polygonsof seven, nine, ten, eleven, thirteen, fourteen and fifteensides, cannot be so readily shown by geometry, but can beeasily obtained by trigonometry—as also said relation of theparts in a regular polygon of any number of sides. The na-ture of…
Carpentry · Architecture · Building
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
