Radford's cyclopedia of construction; carpentry, building and architecture. Based on the practical experience of a large staff of experts in actual constrcution work (1909)
Johnson, Alfred Sidney, 1860-, Radford, William A., 1865- · Chicago Radford Architectural Co · leaf 56
KO <PhK <i- 2 »i c ^ H O oa; o <; oo PRACTICAL CARPENTRY 45 major axis, and DC the minor axis of the ellipse,and FG its two foci. Take a string EFG and passit over the pins and tie the ends together, so thatwhen doubled it may be equal to the distancefrom the focus F to the end of the… … Fig. 52. D B be traced. This is based on the well-knownproperty of the ellipse, that the sum of any twolines drawn from the foci to any points in thecircumference is the same. Problem 28.—^The axes of an ellipse beinggiven, to draw the curve by intersections: LetAC (Fig. 53) be the major axis, and…
Architecture · Building
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