Abstract
In the year 1851 in Paris, the apparent change of the plane of oscillation of a linear pendulum was observed by Léon Foucault. In the same year, at the same place, the unequal duration of the oscillations of a right- and left-handed conical pendulum was observed by Bravais. Today, the Foucault pendula are common at universities, the Bravais pendula not at all. We have revisited and experimentally tested Bravais's method and found it worthy of revitalization in student labs.
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