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 67
the conjugate axis required, and will bear the same proportion toij, asc d does to a b. (See Art. 108.) … 2 3 m 3 2Fi-. 92. 127.— To describe a parabola by intersection of lines. Leem Ij {Fig. 92,) be the axis and height, (see Fig. 79,) and d dy &double ordinate and base of the proposed parabola. Through /draw a a, parallel to d d ; through d and d, draw d a and d a,parallel to ni I; divide a d and…
Carpentry · Architecture
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