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 635
Fig. 413. This is an approximation to an elHpsis; and perhaps nomethod can be found by which a well-shaped oval can bedrawn with greater facility. By a little variation in theprocess, ovals of different proportions may be obtained. Ifquarter of the transverse axis is taken for the radius of… … Fig. 414. 555.—To Draiv a Tangent to an Ellipsis.—Let abed{Fig. 413) be the given ellipsis, and d the point of contact.Find the foci {Art. 548) / and /, and from them, through d,f^draw f e and fd\ bisect the angle {Art. 506) edo with theline sr\ then sr will be the tangent required. TO FIND THE…
Carpentry · Architecture · Building
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