Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 95
llel to n and b b parallel to w,then b is a point in the desired ellipse. 38. To draw an ellipse with a string. Having given the two axes, set off from chalf the great axis at a and b, which are thetwo focuses in the ellipse. Take an endlessstring as long as the three sides in the triangleo, b, c,…
Mechanical engineering · Engineering
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