It has long been known that an arbitrary angle (in the Euclidean plane) cannot be trisected using only ruler and compass, but that this can be done using a mechanical linkage. Given any positive integer $n$ greater than 1, does there always exist a mechanical linkage (as defined by Kempe) that can divide an arbitrary angle (in the plane) into $n$ equal parts?
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The linkage by J.J. Sylvester called "A Lady's Fan" here can readily be generalized to arbitrary $n$.
Hagen von Eitzen
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Many thanks for this information. – Garabed Gulbenkian Sep 04 '15 at 19:25