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compound pendulum
(encz) | compound pendulum, n: |
Compound pendulum
(gcide) | 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 rods of
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 circle 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] |
compound pendulum
(wn) | compound pendulum
n 1: pendulum consisting of an actual object allowed to rotate
freely around a horizontal axis [syn: physical pendulum,
compound pendulum] |
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