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 601
upon a, with ab for radius, describe the arc dbc\ makedb equal to be\ through a and d draw a line; this will bethe tangent required. 558 PRACTICAL GEOMETRY. The correctness of this method depends upon the factthat the angle formed by a chord and tangent is equal to anyinscribed angle in the… … Fig. 365, equal; and the angles dac and dca are equal, because thetriangle adc is d.n isosceles triangle, having its two sides, adand dcy by construction equal; therefore the angles dad anddca are equal. 513.—A Circle and a Tangent Given, to Find the Pointof Contact.—From any point, as a {Fig:…
Carpentry · Architecture · Building
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