Exhibit in the Cleveland Museum of Art, Cleveland, Ohio, USA. Photography was permitted in the museum without restriction. This artwork is old enough so that it is in the public domain.
<bdi><a href="https://en.wikipedia.org/wiki/en:Balthazar_Martinot" class="extiw" title="w:en:Balthazar Martinot"><span title="French master clockmaker">Balthazar Martinot</span></a>
</bdi>
<span class="int-own-work" lang="en">Own work</span>, <a href="//commons.wikimedia.org/wiki/User:Daderot" title="User:Daderot">Daderot</a>