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 541
the parameter,a constant quantity for the subnormal to all points of thecurve. 465—Parabola: Diameters.— In the parabola BAC*{Fig. 306), PD, a diameter (a line parallel with the axis) tothe point P, is in proportion to B T> x B C, the rectangle ofthe two parts into which the base of the parabola… … For NA we have, taking the co-ordinates to the point or— -—- — X, 2p N P or— -—---^NA, (C.) Using these values (B.) and (C.) in (A.), we have—D P=EA —NA, EC NP _EC-NP ~ 2p 2/ ~ 2/ If / be put for B C and n for D C, then—NP=EC-DC=^l- 72. TO FIND THE CONSTITUENT PARTS. 499 and— 2/ then {Art. 412,)- —…
Carpentry · Architecture · Building
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