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 525
B, the twolines PF 2ir\d PF become equal. The proportion between the major and minor axes de-pends upon the relative position of F,F\ the foci; the nearerthese are placed to the extremities of the major axis thesmaller will the minor axis be in comparison with the majoraxis. The nearer /% F… … circle. Then we have PF — PF = B C= A C. From thiswe learn PF+ PF z=^2AC=AM; also, when PF= PF,then PF=BF:=:z AC. From this we may, with given major and minor axes,find the position of i^and F. To do this, on B, as a centre,with A C for radius, mark the major axis at /^and F. 452.—Ellipse :…
Carpentry · Architecture · Building
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