While the Earth 🌎 rotates underneath, the orientation of the #pendulum changes. First used in 1851, Foucault's pendulum was the first simple, direct way to observe Earth's rotation. 🎵: Fin Draper | Griffin Museum of Science and Industry

On this day in 1851, Jean-Bernard-Leon Foucault first demonstrated the nature of the Earth’s rotation experimentally using a pendulum. Later and larger experiments further validated Foucault’s research. The same effect is demonstrated by our own four story Foucault’s Pendulum every day. Learn more: http://bit.ly/1IP6tHV | The Franklin Institute