Google users can take a spin with the latest Google Doodle celebrating the man who crafted the Foucault pendulum.
Born on September 19, 1819, Leon Foucault created the pendulum that bears his name as a way to demonstrate the rotation of our planet. A basic pendulum shows how a weighted, hanging object freely travels back and forth due to the effects of gravity and inertia. The Foucault pendulum took that concept further by showing an object that changed the direction of its swing every so often, thus providing a way to mimic the rotation of the earth.
Foucault first unveiled his pendulum in a public demonstration in February 1851 at the Meridian of the Paris Observatory, according to Wikipedia. That was followed a few weeks later by another showing at the dome of the Pantheon in Paris.
Goodle users can watch the Foucault pendulum in action courtesy of today's Doodle. Watch it long enough, and you'll see the object change direction, knocking down a series of encircling blocks. Don't have enough time? You can speed up the process by clicking on the nearby clock icon and moving the object forward several hours at a stretch.
Those of you curious about the Foucault pendulum will find a helpful description of it at the Smithsonian Institute's Web site.