New Advent
Catholic Encyclopedia: Jean Bertrand Leon Foucault
A lengthy biographical sketch from The New Advent of Jean-Bertand-Leon Foucault (1819-1868 CE) physicist and mechanician. Discusses his upbringing, scientific work, major accomplishments and published articles. Please note that "The...
Smithsonian Institution
Encyclopedia Smithsonian: Foucault Pendulum
Provides a detailed description of the Foucault Pendulum and how it works. It was originally built to demonstrate the rotation of the Earth.