Ipswich Transport Museum
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/58415659@N00">Steve Knight</a> from Halstead, United Kingdom
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/kitmasterbloke/51305359148/">Mercury Arc rectifier</a>