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" ... a curve having the origin for a double point, and the two circular points at infinity for ordinary double points. As a generalization of the ovals of Cassini, we might seek the locus of a point, the product of whose distances from m given points shall... "
A Treatise on the Higher Plane Curves: Intended as a Sequel to A Treatise on ... - Page 204
by George Salmon - 1852 - 316 pages
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The Analytical Theory of Light

James Walker - Light - 1904 - 448 pages
...whence the angle aNy is a right-angle, and the locus of N is a circle. Now the coordinates f, r), Ç of the foot of the perpendicular from the centre on the tangent plane to the wave-surface at the point in which it is met by the ray a- with the direction-cosines...
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