# Construction Of An Ellipse

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An illustration showing how to construct an ellipse using a string. “Having given the two axes, set off from c half the great axis at a and b, which are the two focuses of the ellipse. Take an endless string as long as the three sides in the triangle abc, fix two pins or nails in the focuses, one in a and one in b, lay the string around a and b, stretch it with a pencil d, which then will describe the desired ellipse.”

### Keywords

geometry, ellipse, ellipses, conic sections, conic section, geometric construction, analytic geometry, analytical, construct, ellipse with string### Galleries

Conic Sections: Ellipses### Source

Albert A. Hopkins *Scientific America: Handy Book Of Facts And Formulas* (New York: Munn & Co., Inc., 1918) 39

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