Pendulum
['pendjʊləm] or ['pɛndʒələm]
解释:
(noun.) an apparatus consisting of an object mounted so that it swings freely under the influence of gravity.
整理:苏西--From WordNet
解释:
(n.) 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.
录入:文斯
解释:
n. any weight so hung from a fixed point as to swing freely: the swinging weight which regulates the movement of a clock: a lamp &c. pendent from a ceiling: a guard-ring of a watch by which it is attached to a chain.—adj. Pen′dular relating to a pendulum.—v.i. Pen′dulate to swing vibrate.—adjs. Pen′dulent pendulous; Pen′duline building a pendulous nest; Pen′dulous hanging loosely: swinging freely as the pensile nests of birds: (bot.) hanging downwards as a flower on a curved stalk.—adv. Pen′dulously.—ns. Pen′dulousness Pen′dulosity.—Pendulum wire a kind of flat steel wire for clock pendulums.—Compensation pendulum a pendulum so constructed that its rod is not altered in length by changes of temperature; Compound pendulum every ordinary pendulum is compound as differing from a Simple pendulum which is a material point suspended by an ideal line; Invariable pendulum a pendulum for carrying from station to station to be oscillated at each so as to fix the relative acceleration of gravity; Long and short pendulum a pendulum for determining the absolute force of gravity by means of a bob suspended by a wire of varying length.
录入:卢卡斯
例句:
- But Huygens, the great Dutch scientist, about 1556 was the first to explain the principles and properties of the pendulum as a time measurer and to apply it most successfully to clocks. 威廉·亨利·杜利特. 世纪发明.
- A pendulum carrying a pencil was in constant contact with a strip of paper drawn beneath the pencil. Edward W. Byrn. 十九世纪发明进展.
- The pendulum of the controlling clock, in swinging to either side, makes a brief contact, which completes the circuit of a galvanic battery, and thus sends a current to the controlled clock. 佚名. 神奇的知识之书.
- The isochronism of the vibrations of the pendulum inferred from this observation was not published or put to practical application in clocks for nearly sixty years afterward. 威廉·亨利·杜利特. 世纪发明.
- But the pressure of the escape-wheel against the detent, and the consequent friction, prevent the pendulum from acting freely. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
- In physics they invented the pendulum, and produced work on optics. 赫伯特·乔治·威尔斯. 世界史纲.
- The pendulum rod, _B_, is made of wood, and the bob, _A_, consists of a hollow coil of thick copper wire covered with cotton, through which the hollow bar, _C C_, passes. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
- In it hangs the lamp whose measured swing suggested to Galileo the pendulum. 马克·吐温. 傻子出国记.
- The accompanying diagram will serve to explain more clearly the parts of the clock on which the movement of the pendulum depends. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
- Later he invent ed simple pendulum devices for timing the pulse of patients, and even made some advances in applying his discovery in the construction of pendulum clocks. 李贝. 西洋科学史.
- Soon the pendulum, or weight, will be set swinging. 伯莎M.克拉克. 科学通论.
- On being released the pendulum would return, and in this way zigzag markings, as shown at 4 and 5, would be produced on the strip of paper, which formed the alphabet. Edward W. Byrn. 十九世纪发明进展.
- The pendulum carried also an armature, and an electro-magnet was placed near the armature. Edward W. Byrn. 十九世纪发明进展.
- The opening being then closed by a screw-nut, the apparatus, which is mounted on pivots, with an appropriate stand, is swung backwards and forwards like a pendulum. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
- He and others had used the pendulum for dividing time, but moved it by hand and counted its vibrations. 威廉·亨利·杜利特. 世纪发明.
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