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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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  • Problems with pendulum suspension and rotation - NAWCC Forums
    This Clock has nothing to do with Asia, it is a Regulator completely made in Portugal in the 50s-60s In Portugal there was a tradition of watchmaking that began in the 19th century with pendulum and tower clocks
  • HOW A PENDULUM CLOCK WORKS - NAWCC Forums
    The crutch isn’t attached directly to the pendulum 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 So when the pendulum swings, the crutch swings The rate of the crutch is determined by the rate of the pendulum
  • 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 the position of the pendulum bob Frankly I don't
  • What size weights and pendulum do I need for my cuckoo clock?
    The pendulum I would choose is a 1 5" wide "chalet" style readily available from clock parts vendors Start with a 7" stick (typical length from vendor) and adjust shorten as necessary to achieve best time regulation
  • Pendulum stops after 10-15 minutes - NAWCC Forums
    Ok, we have finally reached the point of this post The clock’s pendulum stops after about 10-20 minutes I have read up a bit on this I have listened to the tick tock and it sounds even to me - like a metronome However, the pendulum does swing in a diagonal back to front motion rather than just side to side
  • Compensated pendulums - NAWCC Forums
    On a "simple pendulum" setup this would cause the pendulum's period of swing to lengthen (slow down) Mercury compensating pendulums contain one or more glass or metal flasks partially-filled with mercury as counterweight When the mercury expands, it moves up inside the flask(s), counteracting the lengthening of the iron pendulum rod
  • 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
  • URGOS 32 PENDULUM LENGTH - NAWCC Forums
    The top piece has been cut off This pendulum is a 'make do' replacement Nearly all UW32s had wood stick pendulums A very few had a small lyre style pendulum but they were smaller and shorter than what you have there I would ditch what you have and order a proper replacement Stick pendulums are readily available and easy to adjust
  • Pendulum Wobble - NAWCC Forums
    If the pendulum hangs from the case, remove the movement and swing the pendulum When free, does it swing poorly If the pendulum swing from a post on the movement, push the crutch off to the side or remove it and swing it If it swings true, the problem is how it is driven If not, it is in the pendulum itself Tinker Dwight





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