Foucault's "fixity" assertion remains true for any model pendulum governed
by purely harmonic restoring forces even if the pendulum motion is not
motion resulting from a release from rest as shown in Fig. 2. Indeed, the most general motion of an harmonic pendulum has in common with the special motion in Fig.
2 the property that it will always appear as an ellipse in a fixed orientation in the frame of the stars. In the frame of the earth these different elliptical motions take on
the patterns shown in Fig. 5.
As in Fig. 2, the Coriolis precession is greatly exaggerated.
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