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pendulum    音标拼音: [p'ɛndʒələm]
n. 钟摆,摇锤

钟摆,摇锤

pendulum
n 1: an apparatus consisting of an object mounted so that it
swings freely under the influence of gravity

Hydrometer \Hy*drom"e*ter\, n. [Hydro-, 1 -meter: cf. F.
hydrom[`e]tre.]
1. (Physics) An instrument for determining the specific
gravities of liquids, and thence the strength spirituous
liquors, saline solutions, etc.
[1913 Webster]

Note: It is usually made of glass with a graduated stem, and
indicates the specific gravity of a liquid by the depth
to which it sinks in it, the zero of the scale marking
the depth to which it sinks in pure water. Extra
weights are sometimes used to adapt the scale to
liquids of different densities.
[1913 Webster]

2. An instrument, variously constructed, used for measuring
the velocity or discharge of water, as in rivers, from
reservoirs, etc., and called by various specific names
according to its construction or use, as {tachometer},
{rheometer}, {hydrometer}, {pendulum}, etc.; a current
gauge. Hydrometric


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]


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  • Pendulum does not keep swinging - NAWCC Forums
    Remember the clock movement powers the pendulum, the pendulum does not power the clock The fact that the clock runs with the pendulum off indicates that all the internal moving parts are free to move If the pendulum swings and there is no tic-toc sounds then the clock isn't running at all - the pendulum, for lack of a better word, is just
  • Catalog of 400 Day Torsion Clock Pendulums - NAWCC Forums
    Latest update: Nov 3, 2025 This article is intended to provide a catalog of 400 day clock pendulums to fill in some of the omissions in the Horolovar Repair Guide and other references It will attempt cover as many of the different variations from each manufacturer as examples have been discovered Pictures and descriptions of each pendulum's characterisics will be provided along with the
  • Beat Setting 101 - NAWCC Forums
    The pendulum passes back and forth across the beat-center in its progression from tick to tock and back The clock is in beat when the beat-center is perfectly vertical: tick and tock impulses are delivered at the exact bottom of the pendulum swing
  • Pendulum weight - NAWCC Forums
    Is there a specification for the pendulum weight of mantel clocks? I can't find anything in a search of the forums I've accumulated weights ranging from < 2 oz to more than 5 oz How does weight affect the timing of the pendulum? If the weight is not critical, is a heavier weight better or
  • At slowest setting, Ansonia mantel clock still runs too fast.
    Hi guys! I made a thread about my Ansonia Iron mantel clock in the General section It runs and chimes great! But ran very fast I have adjusted the pendulum bob as low as it will go and it still gains 2 minutes per hour I've had clocks run too slowly because of gummed up works or worn or
  • Pendulum Length - How to Measure - NAWCC Forums
    A picture of the proposed pendulum would make it easier to recommend how best to proceed with shortening To determine how much to shorten, I would bring the bob all the way up using the regulating screw
  • fast slow dial on mantel clock | NAWCC Forums
    I am trying to get my Ingraham Adrian mantel clock that I got back from the clock repairman to keep accurate time I have been adjusting the nut on the pendulum bob I figure I will use the F S dial on the clock face to fine tune it Question: if the clock is slow do I turn the dial toward the
  • Pendulum Wobble - NAWCC Forums
    - pendulum hanger (if applicable) hooks parallel and lined up with each other so they hang on the bottom of the suspension spring hooks (if applicable) evenly if it's a standard tall case suspension spring with a brass block at the top keeping the pendulum assy from slipping down through the suspension block, make sure there's not too much
  • identification age of Ingraham mantel clock. . . | NAWCC Forums
    I was about to recommend the typical Ingraham mantel clock pendulum until I read the following - "The movement used is our heavy brass pendulum movement, which is well known for its long life and excellent timekeeping qualities " This is a direct quote from Tran Duy Ly's book "Ingraham Clocks Watches"
  • mantel clock pendulum question - NAWCC Forums
    This is my first mantel clock We bought it missing the pendulum bob My question is, do I just need a bob (the ones I see have a loop for a hook, not this) or do I need the entire arm from the suspension spring down? The arm is 3" long





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