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 513
forthe two triangles CB D and CE B {Fig. 295) are homologous(Art. 443) and their corresponding lines in proportion. Put-ting/for CB, we have— CD or—or—and— CB : : CB : CE, :/: :/: 2 ^y /■- = -- 2rv, r = 2V (162.) Or : The radius of a circle equals the square of the chord of halfthe arc divided by… … Fig. 296. cause the centre of the circle is inaccessible, it is desirableto obtain the curve without the use of the radius. This maybe done by calculating ordinates, a rule for which will nowbe developed. Let DCB {Fig. 296) be a right angle, and A DB ^ cir-cular arc described from (7 as a centre,…
Carpentry · Architecture · Building
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