French physicist Léon Foucault used the device in a famous experiment to demonstrate the Earth's rotation. He coined the name "gyroscope" from the Greek words gyros (circle/rotation) and skopeein (to see)—literally, "to see the rotation". Guiding Ships and Astronauts
These videos explore how gyroscopes work, their critical role in historical missions like Apollo 8, and their modern-day applications in our pockets: The hidden story of your phone's gyroscope YouTube · CNET
German physicist Johann Bohnenberger created what he simply called the "Machine," a rotating massive sphere used as a teaching aid.
