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 496
d B ; bisectA F> in E ; with the radius £ C describe the arc E G, ThenA D and D B are sides of a regular dodecagon, or twelve-sided polygon ; of which A C, D C, and B C are radii of thecircumscribing circle, while ^ 6 is a radius of the inscribedcircle. The line A B is the side of a regular… … Fig. 291. homologous triangles, ABE and A EC (the angle ADFequals the angle E A C, and the angles BE A and A E C areright angles); therefore, the two remaining angles DAEand A CE must be equal, and the two triangles homologous{Art. 345). Thus we have— DF .DA :: AE : A C, n \ b \\~ \ R, 2 R b^ 2 n…
Carpentry · Architecture · Building
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
