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<p>mode, until the motion eventually dies away.   </p>

<p>Despite the name, in normal operation it does not swing back and forth as ordinary <a href="page.php?w=pendulum">pendulum</a>s do.  The mass usually has opposing pairs of radial 'arms' sticking out horizontally, threaded with small weights that can be screwed in or out to adjust the <a href="page.php?w=moment_of_inertia">moment of inertia</a> to 'tune' the torsional vibration <a href="page.php?w=Periodic_function">period</a>.</p>

<p><big>Explanation</big></p>
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