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
Fig. 91. the conjugate axis required, and will bear the same proportion toij, as c d does to a b. (See Art. 108.) 123 132 I … 127.— To describe a parabola by intersection of lines. Leettifcj, (Fig. 92,) be the axis and height, (see Fig. 79,) and d dy adouble ordinate and base of the proposed parabola. Through Ldraw a a, parallel to d d ; through d and d, draw d a and d a,parallel to m I; divide a d and d m, each into a…
Carpentry · Architecture
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