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 68
Xoml; from each point of division in da, draw lines to I; then a curve traced through the points ofintersection, o, o and o, will be that of a parabola. 127, a.—Another method. Let rn, I, {Fig. 93,) be the axis andheight, and d d the base. Extend m I, and make I a equal to mI /join a and d, and a… … mFig. 93. j>l2.<o3 Z L p Fig. 94. 128.— To describe an hyperbola by intersection of lines.Let r 0, (Fig. 94,) be the height, p p the base, and n r the trans-verse axis. (See Fig. 79.) Through r, draw a a, parallel to pp ; from p, draw a p, parallel to r 0 ; divide a p and p 0, eachinto a like…
Carpentry · Architecture
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