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The other witty idea was the method to show the small difference (about 0.001%) in weight. If the rotation period of the balance equals to the period of the balance oscillation, resonance occurs, which allows to observe the difference with the naked eye. If the resonance is perfect, the rotation of the bean takes place in a tilted plane.

The importance of the experiment lies in two facts. First, it contributed to prove the rotation of the Earth in a dynamic way, secondly it provides a new method to calculate the angular velocity of the earth.

Click on the button to start/stop the spinning of the balance.