The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 68
Fig. 91. the conjugate axis required, and will bear the same proportion to j, asc d does to a b. (See Art. 108.) 1 2 3 i 3 2 1 … 127.— To describe a parabola by intersection of lines. Letm Ij {Fig. 92j) be the axis and height, (see Fig. 79,) and d d, a.double 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 ni I; divide a d and d m, each into a…
Carpentry · Architecture
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