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 ]
69 Moby Thesaurus words for "
pendulum ":
Indian file ,
array ,
articulation ,
bank ,
buzz ,
catena ,
catenation ,
chain ,
chain reaction ,
chaining ,
concatenation ,
connection ,
consecution ,
continuum ,
course ,
cycle ,
descent ,
drone ,
endless belt ,
endless round ,
file ,
filiation ,
gamut ,
gradation ,
hum ,
line ,
lineage ,
metronome ,
monotone ,
nexus ,
oscillator ,
periodicity ,
plenum ,
powder train ,
progression ,
queue ,
range ,
rank ,
recurrence ,
reticulation ,
rocker ,
rocking chair ,
rocking stone ,
rotation ,
round ,
routine ,
row ,
run ,
scale ,
seesaw ,
sequence ,
series ,
shuttle ,
shuttlecock ,
single file ,
spectrum ,
string ,
succession ,
swath ,
swing ,
teeter ,
teeter -
totter ,
teeterboard ,
teetery -
bender ,
thread ,
tier ,
train ,
vibrator ,
windrow
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