Abstract
A PENDULUM which is free to swing over a segment of a sphere has possible paths which vary from a rotation resembling an engine governor ball to the swing of a simple pendulum in a plane; which plane appears to rotate very slowly but really indicates the rotation of the earth beneath it (Foucault pendulum effect).
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FRANKLIN, C. The Spherical Pendulum*. Nature 132, 1011–1012 (1933). https://doi.org/10.1038/1321011a0
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DOI: https://doi.org/10.1038/1321011a0