# Pendulum wheel

Pendulum wheel
Pendulum Pen"du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the movements of clockwork and other machinery. [1913 Webster]

Note: The time of oscillation of a pendulum is independent of the arc of vibration, provided this arc be small. [1913 Webster]

{Ballistic pendulum}. See under {Ballistic}.

{Compensation pendulum}, a clock pendulum in which the effect of changes of temperature of the length of the rod is so counteracted, usually by the opposite expansion of differene metals, that the distance of the center of oscillation from the center of suspension remains invariable; as, the mercurial compensation pendulum, in which the expansion of the rod is compensated by the opposite expansion of mercury in a jar constituting the bob; the gridiron pendulum, in which compensation is effected by the opposite expansion of sets of rodsof different metals.

{Compound pendulum}, an ordinary pendulum; -- so called, as being made up of different parts, and contrasted with {simple pendulum}.

{Conical pendulum} or {Revolving pendulum}, a weight connected by a rod with a fixed point; and revolving in a horizontal cyrcle about the vertical from that point.

{Pendulum bob}, the weight at the lower end of a pendulum.

{Pendulum level}, a plumb level. See under {Level}.

{Pendulum wheel}, the balance of a watch.

{Simple pendulum} or {Theoretical pendulum}, an imaginary pendulum having no dimensions except length, and no weight except at the center of oscillation; in other words, a material point suspended by an ideal line. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• Pendulum — Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the movements …   The Collaborative International Dictionary of English

• Pendulum bob — Pendulum Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the… …   The Collaborative International Dictionary of English

• Pendulum level — Pendulum Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the… …   The Collaborative International Dictionary of English

• Pendulum clock — A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. From its invention in 1656 by Christiaan Huygens until the 1930s, the pendulum clock was the world s most accurate timekeeper, accounting for its… …   Wikipedia

• Wheel train (horology) — In horology, a wheel train (or just train) is the gear train of a mechanical watch or clock.[1] Although the term is used for other types of gear trains, the long history of mechanical timepieces has created a traditional terminology for their… …   Wikipedia

• pendulum watch — noun (18th century) a watch with a balance wheel having a fake pendulum attached to it • Hypernyms: ↑watch, ↑ticker * * * noun : a late 18th century watch with a mock pendulum attached to a concealed balance wheel and showing through a curved… …   Useful english dictionary

• Ballistic pendulum — Pendulum Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the… …   The Collaborative International Dictionary of English

• Compensation pendulum — Pendulum Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the… …   The Collaborative International Dictionary of English

• Compound pendulum — Pendulum Pen du*lum, n.; pl. {Pendulums}. [NL., fr. L. pendulus hanging, swinging. See {Pendulous}.] A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum. It is used to regulate the… …   The Collaborative International Dictionary of English