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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
  • Wind up pendulum clock runs too fast or stops - NAWCC Forums
    Please put the pendulum on and then take a video of at least 30 sec or longer It is mandatory to have the pendulum attached to assess the beat,etc, Running the clock without the pendulum means very little at all
  • 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
  • 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
  • Pendulum fails to keep swinging - NAWCC Forums
    Hi, I have a Kienzle Grandmother clock circa 1920 The problem I have is that once I start the pendulum swinging it will only work for around 5 minutes Also there are three winding holes on the front, what is each one for Thankyou
  • Adjusting the length of the pendulum - NAWCC Forums
    I've taken an Edisonian approach to finding the right length of a pendulum in order to make a mechanical clock a good timekeeper I suppose I could take an ab initio approach and count pinion leaves and wheel teeth to obtain the proper length, but that would probably still require me to adjust
  • 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
  • Interpret pendulum length spec on movement - NAWCC Forums
    To measure a Hermle pendulum length, you need to find the "CM" number stamped on the back of the clock movement, which represents the pendulum length in centimeters, measured from the suspension point at the top of the movement all the way down to the bottom of the pendulum nut threads; this includes the pendulum itself, the leader, and the
  • Attaching Seth Thomas Pendulum - NAWCC Forums
    The pendulum is likely hanging on an iron bracket With the movement removed from the iron bracket, it is easy to hang the pendulum and then get the crutch rod into the pendulum slot when the movement is re-installed This situation is why many of these clocks came with pendulum tie downs so that the pendulum did not have to be removed re
  • Pendulum stops after 10-15 minutes - NAWCC Forums
    However, the pendulum does swing in a diagonal back to front motion rather than just side to side If you’re looking at the clock face and start the pendulum by moving it to the right, it will then swing to the left and back slightly, then to the right and forward slightly





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