1914•Journal of the Indian Mathematical SocietyRequires access
On the Bicircular Quartic
Amie Wilkinson
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Abstract
A bicircular quartic can be generated in four and only four ways as the envelope of a circle which cuts a fixed circle orthogonally and whose centre moves on a fixed central conic. This fixed conic is called a focal conic and the four focal conies corresponding to the four methods of generating the quartic are confocal, their foci being the double foci of the quartic.