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 537
or, draw AID 494 THE PARABOLA. perpendicular to L V, and from P, the point of its intersectionwith the line T [/, draw a line to F, the focus; then, becauseRP is a. perpendicular from the middle of MF, MPF is anisosceles triangle, and therefore the lines J/Pand FP areequal, or the point P is… … Fig. 305. the point P\ join U to i/and to F. Then, since f/is a pointin the line T U, M UF, for reasons above given, is an isosce-les triangle ; from C/draw U F perpendicular to L V. Now,if the point ^be also in the curve, the lines C/Fand UF,by the law of the curve, must be equal; but UF, as…
Carpentry · Architecture · Building
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