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 547
\n R\ make A L andA F each equal to NR ; then L M, drawn perpendicular toTO, will be the directrix. Parallel to LM draw the linesBD, CE, etc., at discretion. Then with the distance B L for 504 THE PARABOLA. radius, and on i^ as a centre, mark the line B D with an arc;the intersection of the arc and… … Fig, 3ro, line from /^ as a centre by a radius equal to the perpendicu-lar distance between that line and L M, the directrix. Thena curve traced through the points of intersection thus ob-tained will be the required parabola. 470.—Parabola: De§cribed from Orc1iiiate§.—With agiven base, NP {Fig.…
Carpentry · Architecture · Building
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