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 535
e logarithmof 68-684 found in the table (see Art. 427). SECTION XIII.—THE PARABOLA. 460.—Parabola : I>efinitioiis.—The parabola is one ofthe most interesting of the curves derived from the sectionsof a cone. The several curves thus produced are as fol-lows : When cut parallel with its base the… … 304. a plane cutting it parallel with one side of the cone is aparabola. Let the lines L M and L N (Fig. 304) be at right angles ;draw CFB parallel with LM; make LQ = LF\ draw QBparallel with LF\ then FB — B Q. Now let the line A Lmove from FL^ but remain parallel with it, and as it moveslet it…
Carpentry · Architecture · Building
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