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It's easy to measure the period using the photogate timer. The inner gimbal of the Foucault gyroscope was balanced on knife edge bearings on the outer gimbal and the outer gimbal was suspended by a fine, torsion-free thread in such a manner that the lower pivot point carried almost no weight. For that, it can be demonstrated, by composing the infinitesimal rotations, that the precession rate is proportional to the projection of the angular velocity of Earth onto the normal direction to Earth, which implies that the trace of the plane of oscillation will undergo parallel transport. An excerpt from the illustrated supplement of the magazine Le Petit Parisien dated November 2, , on the 50th anniversary of the experiment of Leon Foucault demonstrating the rotation of the earth. A 'pendulum day' is the time needed for the plane of a freely suspended Foucault pendulum to complete an apparent rotation about the local vertical. A Foucault pendulum at the North Pole:
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To minimize the effect with amplitude, pendulum swings are kept as small as possible. Increase the length of the string and increase the angle. Ideally, the impulse should be evenly distributed on either side of the lowest point of the pendulum's swing.
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