A three phase, six anode <a href="https://en.wikipedia.org/wiki/mercury_arc_rectifier" class="extiw" title="w:mercury arc rectifier">mercury arc rectifier</a>, formerly used at a 600V DC traction substation of the Athens-Piraeus railway. Today on display at the <a href="https://en.wikipedia.org/wiki/ISAP" class="extiw" title="w:ISAP">ISAP</a> museum at Piraeus station.
© 2009 K. Krallis <a href="//commons.wikimedia.org/wiki/User:Sv1xv" title="User:Sv1xv">SV1XV</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>