Pendulum

(noun.) an apparatus consisting of an object mounted so that it swings freely under the influence of gravity.

整理:苏西

• 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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