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
e m in r, and/pin s ; make 7* m equal to A r, and h p equal to h s ; then r mand * p will be the axes required, by which the ellipsis may bedrawn in the usual way. 126.— To describe an ellipsis, whose axes shall be propor-tionate to the axes of a larger or smaller given one. Let ac b d, (Fig. 91,)… … 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
Carpentry · Architecture
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