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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
  • Westminster chime and pendulum - NAWCC Forums
    I interpreted your word "stem" equating to 'pendulum hanger post', 'suspension spring post', 'suspension cock', etc Shorten it about 1", or whatever it takes to give you the maximum clearance between: pendulum, weights and chime rods
  • Hermle 451-050H runs briefly then stops - NAWCC Forums
    The clock will run for about 20 cycles of the pendulum and then you can see the piece holding the pendulum will jump stutter and it stops I could only upload this short clip because of file upload limitations
  • 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
  • ALL ABOUT PENDULUMS | NAWCC Forums
    A basic pendulum consists of a weighted bob, and a stick, hanging from some suspension point The pendulum is the whole thing, because when we talk about "the mass (weight) of a pendulum", we're including the mass of the stick
  • 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
  • Hermle movement stopped ticking - NAWCC Forums
    I have a Hermle 451-05CH movement for a clock we’ve had for years It has a chain winding system Today, when I went to wind the clock, the pendulum fell off for some reason I rehung the pendulum and tried to restart the clock, but there is no more tick tock sound and pendulum eventually stops
  • The Dead-Beat Escapement - NAWCC Forums
    The action in which the escape wheel transfers energy into the pendulum by exerting force on the appropriate pallet face For most designs, this is 2 degrees If the pendulum is heavy, it will be designed to 1 1⁄2 degrees Lock The quantity of distance a wheel tooth, immediately after drop, overlaps the concentric dead-face of the pallet





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