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Updated: August 22, 2026
By this characteristic we recognize the 'logarithmic spiral. Geometricians give this name to the curve which intersects obliquely, at angles of unvarying value, all the straight lines or 'radii vectores' radiating from a centre called the 'Pole. The Epeira's construction, therefore, is a series of chords joining the intersections of a logarithmic spiral with a series of radii.
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