Foucault pendulum

noun

, Physics.

1. a pendulum that demonstrates the rotation of the earth by exhibiting an apparent change in its plane of oscillation.

Foucault pendulum

1. A pendulum suspended from a long wire, set into motion, and sustained in motion over long periods. Due to the axial rotation of the earth, the plane of motion of the pendulum shifts at a rate and direction dependent on its latitude, clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. At the poles the plane rotates once per day, while at the equator it does not rotate at all.

Word History and Origins

Origin of Foucault pendulum¹

First recorded in 1850–55; named after J.B.L. Foucault

Example Sentences

They get swept up in the main entrance — where the Tesla Coil lightning show draws gasps and the elegant Foucault pendulum demonstrates how the Earth twirls, confusing dozens of onlookers at a time.

From Los Angeles Times

The first thing I noticed was that the duct tape had come off my Foucault pendulum.

From Literature

Some experts are concerned that when it gains ownership the Orthodox Church will neglect the exhibits on display, which include a rare Foucault pendulum.

From Washington Post

Some experts are concerned that when it gains ownership, the Orthodox Church will neglect the exhibits on display, which include a rare Foucault pendulum.

From Seattle Times

Some experts are concerned that the Orthodox Church will neglect the exhibits on display, which include a rare Foucault pendulum.

From Washington Times