The working status of vertical pendulum tiltmeter in Yanshou Seismostation of Harbin is introduced, and several earthquake strain steps recorded by the instrument are presented.

介绍了哈尔滨市延寿地震台竖直摆倾斜仪的工作状态，列举了该仪器记录到的多次同震应变阶。

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The principle of measuring minute impulse and the design of impact pendulum are introduced, including its physical principle, configuration, performance and working performance.

介绍了测量微小冲量的原理及冲击摆的组成，包括冲击摆的物理原理，冲击摆装置的结构、性能和工作原理；

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The paper introduced the structure and working process of an inverted pendulum of type JN-1 with deformation and loading systems.

本文介绍了真空倒扭摆内耗形变加载装置的结构特征和工作原理。

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Then in 1656, Dutch mathematician Christiaan Huygens made the first working pendulum clock, accurate to an error of less than one minute per day.

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