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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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  • 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
  • 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
  • Timing: Beats per hour | NAWCC Forums
    No missing pendulum Here are 2 photos from BEFORE cleaning: And one after cleaning The original measurement of 8325 BPH was after cleaning and running well, keeping pretty accurate time I have tried adjusting the pendulum rod nut down till the measurement reading was near 8277 on my clock tuner app, but it was losing several minutes per day at that rate So, I am going back to the 8325 rate
  • 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
  • The Dead-Beat Escapement - NAWCC Forums
    The action in which the escape wheel transfers energy into the pendulum by exerting force on the appropriate pallet face For most designs, this is 2 degrees If the pendulum is heavy, it will be designed to 1 1⁄2 degrees Lock The quantity of distance a wheel tooth, immediately after drop, overlaps the concentric dead-face of the pallet
  • Help - Amplitude of Pendulum | NAWCC Forums
    I have a question regarding the amplitude (swing arc) of the pendulum This is a Seth Thomas (ST) 113A and I also have a ST 113 movement The pendulum on the ST 113 swings considerably more than the 113A in the video above Is there an optimum for the amplitude of the swing? Is there
  • Crutch adjustment - NAWCC Forums
    If the pendulum won't hang straight, or wobbles, check and try to straighten the pendulum's suspension spring If it's kinked, replace it And pay close attention to where the crutch wire is formed into a loop that surrounds the pendulum rod
  • Escape wheel question - NAWCC Forums
    Here's a question (or two) that have occurred to me as a result of stuff in another thread The fewer teeth in an escape wheel, the more rotation (degrees) per tooth, right? You can slow its rotational speed by lengthening the pendulum (longer time between teeth), right? OR, you can slow its
  • Hermle 451-050H runs briefly then stops - NAWCC Forums
    The clock will run for about 20 cycles of the pendulum and then you can see the piece holding the pendulum will jump stutter and it stops I could only upload this short clip because of file upload limitations
  • 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





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