Planets In , I see specialty was published a page for the 10 most beautiful experiments throughout history.
Last year when scientists mounted a pendulum above the South Pole and watched him swing were replicated a demonstration in Paris in 1851. Using a steel cable 220 feet long, the French scientist Jean-Bernard-Léon Foucault suspended a 62-pound ball of iron from the cupola of the Pantheon and set it in motion, rocking. To mark its progress on a needle hooked the ball and placed a ring of wet earth on the floor beneath him.
The audience watched in awe as the pendulum inexplicably appeared to rotate, leaving a slightly different line on every swing. It was actually the floor of the Pantheon which was slightly moving, and Foucault had shown, more convincingly than ever, that the earth revolves on its axis. At the latitude of Paris, the pendulum stroke completed a full rotation clockwise every 30 hours in the southern hemisphere rotate counterclockwise, and Ecuador did not rotate anything. At the South Pole, as confirmed by scientists of the modern era, the period of rotation is 24 hours.
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