Free pendulum diagram
<ul><li><a href="//commons.wikimedia.org/wiki/File:PendulumLayout.png" title="File:PendulumLayout.png">PendulumLayout.png</a>: <a href="https://en.wikipedia.org/wiki/User:Ben%2Bpcc" class="extiw" title="en:User:Ben+pcc">Ben pcc</a></li>
<li>Derivative work: <a href="//commons.wikimedia.org/wiki/User:Zerodamage" title="User:Zerodamage">Zerodamage</a></li></ul>
2012-08-05
<ul><li><a href="//commons.wikimedia.org/wiki/File:PendulumLayout.png" title="File:PendulumLayout.png">PendulumLayout.png</a></li></ul>