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 69
2 2, (fee, parallel to ml; from each point of division in da, draw lines to I; then a curve traced through the points otintersection, o, o and o, will be that of a parabola. 127, a.—Another method. Let m, I, {Fig. 93,) be the axis andheight, and d d the base. Extend m I, and make I a equal to… … Fig. 93.
Carpentry · Architecture
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