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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
    Hello I'm new to fixing clocks I have this clock, Reguladora, apparently it looks good, I lubricated it but without the pendulum it doesn't rotate, I have others and they rotate, I thought about weak spring energy It's making a strange noise and the pendulum suspension spring is twisted, I
  • Precision Pendulum Clock, Konrad Marwitz, Munich - NAWCC Forums
    The pendulum is quite light, the cylinders are hollow and apparently were at some juncture filled with lead pellets, a few fell out when opening the cylinders Interestingly, there are conflicting opinions between real experts on whether the pendulum body in a precision clock shall be rather light or rather heavy
  • 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 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
  • 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
  • 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
  • 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
  • URGOS 32 PENDULUM LENGTH - NAWCC Forums
    Greetings, I have a previous customer who moved out of state and during the move the top of the pendulum broke off She shipped me the pendulum without the broken part (it was lost) and ask me to repair it She is unable to get the numbers off the rear plate but my records show a uw32 It is the
  • Pendulum clock runs slowly with pendulum bob all the way up
    Hermle Clock Pendulum Measuring The clock may be equipped with the wrong pendulum and the pendulum you have may be able to be modified to suit the clock movement (Shortened) There is a date code stamped on the rear of the movement, at the top of the stamping panel That date code can be a number or letter
  • How to determine suspension spring length | NAWCC Forums
    The pendulum length calculated will usually be from the center of oscillation to somewhere near the center of the pendulum bob From the wheel tooth count, you can also determine the beats per hour minute that will result in good timekeeping The BPH can be converted to pendulum length from charts that are readily available





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