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Globe representing the rotating Earth. The small triangular piece above the slot represents the Foucault pendulum. This can be set at any latitude. Its rate of rotation relative to that of the globe reproduces exactly that of the Foucault pendulum at that latitude.
Photograph of Foucault pendulum swinging in the rotunda of the building of the National Academy of Sciences, Washington, D. C., with small model and miniature pendulum at its side illustrating the principle of the Foucault pendulum.
In this diagram
Photograph of driving mechanism of model illustrating the action of the Foucault pendulum.