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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 stops swinging after 1 minute (Brand: Seth Thomas)
    Its pendulum seems to be triple component one, hinged 1st at the top hook and again at the bob rod connector A slight but distinct wobble is visible at the top 'hinge' and possibly a smaller one at the bottom one Two component pendulums move in such complex ways that predicting them is mathematically impossible, a three component one? Who knows
  • 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
  • Conical pendulums. doc - NAWCC Forums
    ABOUT CONICAL PENDULUMS conical pendulum isnʼt a pendulum shaped like a cone Itʼs a weight on the end of a string thatʼs swung in a circle from a suspension point so the string describes a conical path Unlike a swinging pendulum, its motion is continuous rather than in discrete back-and-forth bits
  • HOW A PENDULUM CLOCK WORKS - NAWCC Forums
    The pendulum hangs from a flat suspension spring, and swings freely But the rod or leader of the pendulum passes loosely through a loop in the end of the crutch
  • Cuckoo pendulum keeps stopping - NAWCC Forums
    Have a Schneider cuckoo clock, just bought it used, looks very nice not too old, having a problem with the pendulum, it keeps stopping only swings for up to about 3 minutes I loosened the time chain off its cog wound it another length of the chain, thought that would help but didn’t seem
  • 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 [BASIC PENDULUM] View attachment 183643 The period of a pendulum is the amount of time it takes to swing back and forth: from one side of its arc to the other, and back
  • 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
  • Junghans mantel clock: pendulum suspension (?) spring replacement
    One of my educational clocks is an early 20th century Junghans This is a pendulum clock with a five tone strike mechanism The pendulum suspension (assuming I have the term correct) appears damaged My first question is: is it damaged beyond repair? If so, how do I correctly describe it so that I can search around to find a suitable replacement?
  • Clock Parts Terminology - NAWCC Forums
    Pendulum returns again and another impulse provided to pendulum as tooth pushes against EXIT impulse (LIFT) face Drop precedes next entrance lock The terms used in this diagram are the same for a RECOIL escapement altho there are two differences in motion and design 1 After lock, pallet pushes wheel and entire train backwards - ergo recoil
  • Clock Repair - NAWCC Forums
    Clock movement repair techniques and troubleshooting problem area ==> PLEASE POST PHOTOS WHEN ASKING QUESTIONS - We need to see what you're seeing! Clock Hints Tricks | Clock Parts Wanted





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