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 492
ea ofE G D, one of these triangles, is equal to the product of E D,the base, into the half of GH, the perpendicular; or, whenN is put to equal the area— N — EDy. , SIDE AND AREA OF OCTAGON. 449 2 and, since r, as above, equals ^ 3 —, 2 4 This is the area of one of the six equal triangles;… … Fig. 2go. 4-36b—Octagon: Radius of Circiimscribed and In-scribed Circles: Area.—Let CEDBF{Fig. 290) represent aquarter of a regular octagon, in which i^is the centre, EDa side, and C E and D B each half a side, while CF andB F are radii of the inscribed circle, and EF and DF areradii of the…
Carpentry · Architecture · Building
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