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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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  • Comtoise - what is correct pendulum and wieghts? - NAWCC Forums
    I have got pendulum - thin flat foldable rod with brass wieght 156 g My friend use weights around 3,8 kg But my comtoise stopped soon So I tried lighter pendulum (about 140g) and starget to add weights Now I´m on 4,7 kg and it looks it could work But I don´t overweight the movement I affraid it will be worn-out sooner
  • Gents Pulsynetic Pendulum - NAWCC Forums
    Welcome to the Message Board spudfer Sadly, many master clocks are found without the pendulum because the unmanageable long pendulum rod and the heavy bob were usually removed and stored separately Never to be rejoined as the whole clock You don't state exactly if the timepiece is badged as a Pulsynetic or as a Gent's of Leicester And which model? Most of the commonly available are Gents C
  • Hermle pendulum length question - NAWCC Forums
    In regards to a Hermle 341-020 movement specifically, how many parts are unique between one with an 11 cm length versus a 35 cm? I ask because I just receive a used movement from a popular auction site that the seller confirmed for me that it was marked 11 cm However, it's actually 35, and I'm
  • Pendulum swing Angle - NAWCC Forums
    Pendulum swing angle is the total angle In your example of 4 degrees, this would be 2 degrees to the left of vertical and 2 degrees to the right for a total of 4 degrees
  • cleaning morbier pendulum - NAWCC Forums
    can anyone guide me on cleaning a very ornate morbier pendulum without doing any harm to the brass - espicially the painted floral areas on it - i believe it is called polychrome-- also does anyone know where i might be able to find a nice dial surround with a painted floral motif for a morbier
  • Clock Runs For Hours Days Without Bob Pendulum But Not With Bob . . .
    Rational: Leveling (beat) and the absence presence of power are non issues since in my experience an unlevel out of beat clock runs even less without a pendulum bob than with, and if there is enough power to keep a crutch without a pendulum bob moving for hours then clearly it is getting power However, is it possible there is not "enough" power?
  • What is the Limitation on Pendulum Weight? - NAWCC Forums
    So, for the simple pendulum, the mass has no effect On a practical pendulum the bob rotates some and has a physical mass outward from the bob The adds additional rotational inertia that slows it some over what a simple pendulum does The bad part is the lowering the CG only increase the effect of the pull of gravity, speeding the period
  • Wobbly pendulum on HMiller - NAWCC Forums
    Over the years I've had lots of HM grandfather clocks, all with the large heavy lyre pendulums At least half of them have had wobbly pendulums I used to easily fix wobble by ensuring the suspension spring was fitted tight in the chops and that the pendulum located snuggly in the leader
  • Needing info on how to rehang a pendulum | NAWCC Forums
    Hello! I inherited my grandmother's grandfather clock several years ago It has had to be moved 3 times and the last time the pendulum fell off and I can't figure out how to hang it again I can post photos if that would be of help Thanks!
  • 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





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