Foucault pendulum in Elliott Museum
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jared422/">Jared</a>
CC BY 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/jared422/35601353230/">https://www.flickr.com/photos/jared422/35601353230/</a>