Pendulums

thumb|300px|"Simple gravity pendulum" model assumes no friction or air resistance.

A metronome () is a device that produces an audible click or other sound at a uniform interval that can be set by the user, typically in beats per minute (BPM). Metronomes may also include synchronized visual motion, such as a swinging pendulum or a blinking light. Musicians—and others including dancers, athletes, and health professionals—often practise with a metronome to improve their timing, especially the ability to maintain a steady tempo with a regular beat or pulse. Composers and conductors often use numerical metronome markings to communicate their preferred tempos to musicians prepari

simple device conceived as an experiment to demonstrate the rotation of the Earth

to and fro periodic motion in science and engineering

timekeeping device

idealized concept of a pendulum

pendulum with another pendulum attached to its end

type of spring

pendulum

23 m metronome in Letná Park, Prague, Czechia, built in 1991

reversible free swinging pendulum

a pendulum in which bob revolves in horizontal circular motion, and string traces a curve surface.

pendulum with center of mass above pivot

thumb|Harmonograph thumb|A harmonograph A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image. The drawings created typically are Lissajous curves or related drawings of greater complexity. The devices, which began to appear in the mid-19th century and peaked in popularity in the 1890s, cannot be conclusively attributed to a single person, although Hugh Blackburn, a professor of mathematics at the University of Glasgow, is commonly believed to be the official inventor.

clock that uses a torsion pendulum to keep time

pendulum whose period is precisely two seconds

part of a pendulum clock as designed by John Harrison

a swinging pendulum that is also elastic

physical system consisting of a mass moving on the surface of a frictionless sphere in a uniform gravitational field

rigid pendulum