<p>What appears to be a J.L. Fisher "Model 11" <a href="//commons.wikimedia.org/wiki/Camera_dolly" title="Camera dolly">camera dolly</a> mounted on circular track.  Taken by <a rel="nofollow" class="external text" href="http://www.jack-kelly.com">Jack Kelly</a> during the shooting of a music video in London.
</p>
See also <a href="//commons.wikimedia.org/wiki/File:Production_still.jpg" title="File:Production still.jpg">Image:Production still.jpg</a> which includes humans for scale.
No machine-readable author provided. <a href="//commons.wikimedia.org/w/index.php?title=User:Dan_aka_jack&amp;action=edit&amp;redlink=1" class="new" title="User:Dan aka jack (page does not exist)">Dan aka jack</a> assumed (based on copyright claims).
CC BY 2.5
No machine-readable source provided. Own work assumed (based on copyright claims).