The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 65
arc, j i ; upon h and/ with h k for radius, describe the arcs, j k and I i; this willcomplete the figure. This is a very near approximation to an ellipsis; and perhaps nomethod can be found, by which a well-shaped oval can be drawnwith greater facility. By a little variation in the process, ovalsof… … 122.— To draw a tangent to an ellipsis. Let abed, {Fig.88j) be the given ellipsis, and d the point of contact. Find thefoci, [Art. 115,)/and/, and from them, through d, draw/e andf d; bisect the angle, [Art. 77,) e d o, with the line, 5 r ; thens r will be the tangent required.
Carpentry · Architecture
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