Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 65
e ni in r, and/^in s ; make h m equal to h r, and A _p equal to h s ; then r 7n>and 5 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 acbd, {Fig.… … Fig. 91. the conjugate axis required, and will bear the same proportion toij, asc d does to a h, (See Art. 108.) 1 2 3 3 2 1 o\^^ V? i ^ [^ 7 \^ a ^ e 1 n \ k 0 \ e 1 \ d 1 2 3 m 3 Fig. 92. 2 1 <f 127.— To describe a parabola by intersection of lines. Letm I, {Fig. 92j) be the axis and height,…
Carpentry · Architecture
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