Seconds pendulum
Pendulum whose period is precisely two seconds / From Wikipedia, the free encyclopedia
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A seconds pendulum is a pendulum whose period is precisely two seconds; one second for a swing in one direction and one second for the return swing, a frequency of 0.5 Hz.[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Pendulum2secondclock.gif/320px-Pendulum2secondclock.gif)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Simple_pendulum_height.svg/320px-Simple_pendulum_height.svg.png)