{"id":19171,"date":"2024-09-18T09:58:57","date_gmt":"2024-09-18T07:58:57","guid":{"rendered":"https:\/\/educationalevidence.com\/?p=19171"},"modified":"2024-09-18T09:59:26","modified_gmt":"2024-09-18T07:59:26","slug":"the-foucault-pendulum","status":"publish","type":"post","link":"https:\/\/educationalevidence.com\/en\/the-foucault-pendulum\/","title":{"rendered":"The Foucault pendulum"},"content":{"rendered":"
\n

IT HAPPENED<\/span><\/h3>\n<\/blockquote>\n

The Foucault pendulum<\/h1>\n
\"\"
P\u00e9ndulo de Foucault en el Pante\u00f3n de Par\u00eds. \/ Wikimedia<\/figcaption><\/figure>\n

 <\/p>\n

On September 18, 1819, Jean Bernard L\u00e9on Foucault<\/strong><\/a> was born in Paris. He was a French physicist, best known for his demonstration of the Foucault pendulum<\/strong>, a device that proved the effect\u00a0 of\u00a0 Earth rotation<\/strong> on its own axis. But this was not, by any means, his only scientific achievement. He alson invented the gyroscope, took the first photographs of the Sun, discovered the Foucault currents \u2013 an electrical phenomenon that bears his name \u2013 measured the speed of light, which he established at 298,000 km\/s, with 0.6% error over the currently accepted value.<\/p>\n

\"\"
Portrait L\u00e9on Foucault, stamp on backside: \u201c3 Sept. 82\u201d<\/figcaption><\/figure>\n

He studied high school at the Coll\u00e8ge Stanislas in Paris, where he met and became friend of Hippolyte Fizeau<\/strong> \u2013 also a prominent physicist \u2013, although they later became rivals. He began studying medicine at the University, becoming interested in the studies of the bacteriologist Alfred Done<\/strong> on microscopic anatomy, but abandoned medicine and moved for physics, apparently because he developed a phobia of blood.<\/p>\n

In 1851, inspired inspired by observing a thin flexible rod on the axis of a lathe, which vibrated in the same plane despite the rotation of the supporting frame of the lathe, he carried out his most spectacular experiment, which brought him great popularity beyond the strictly scientific field. He built a gigantic spherical pendulum<\/strong> in the Pantheon in Paris \u2013 he had previously tested it at the Observatory \u2013 with a 28kg cannonball covered in brass, hanging from a 67-metre cable and a period of 16 seconds. A circular pool of 3m radius filled with sand was placed under the suspension point. The sand was swept by the metal needle placed at the bottom of the cannonball. The result was that the pendulum’s oscillation plane rotated clockwise.<\/p>\n

If we place a circular platform at the base of a swinging pendulum and make it rotate, the plane of the oscillations is not altered from the perspective of an inertial observer, but it is for a non-inertial observer, that is, one placed on the rotating platform, since the oscillations will precess on the axis of rotation of the pendulum, in the opposite direction to the rotation of the platform. And this is, neither more nor less, the demonstration of the rotational movement of the Earth. If we had placed the pendulum at the North Pole, the Earth would have rotated 360o<\/sup> of the pendulum every 24 hours. Being at another latitude, and depending on which one it is, the time is longer than at the Pole. The plane of oscillation of the pendulum in Paris rotated 11o<\/sup> per hour, so that it completed the circle in 32.7 hours. For an observer placed “on” the Earth, the plane of oscillation is contrary to that of the rotation. It is actually an apparent effect, because it is not the pendulum that moves, but the base in a clockwise direction. An inertial effect in which the enormous mass suspended from a cable placed at a great height allows the pendulum to maintain its initial direction indefinitely. With an electromagnet, the oscillating movement can be perpetual.<\/p>\n

The pendulum was later transferred to the Museum of Arts and Crafts in Paris, returning to the Pantheon in 1902. Today, an original copy of the pendulum is still in operation under the dome of the Pantheon.<\/p>\n

L\u00e9on Foucault received numerous awards and prizes throughout his life for his scientific activity. He died in Paris on February 11, 1868, at the age of 48, a victim of what appears to have been rampant multiple sclerosis. He is buried in the Parisian cemetery of Montmartre.<\/p>\n

\n

Source:\u00a0educational EVIDENCE<\/strong><\/p>\n

Rights:\u00a0Creative Commons<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

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