Electroplating plant.
Maurice de Kay Thompson
<a rel="nofollow" class="external text" href="https://archive.org/stream/appliedelectroch00thomrich#page/2/mode/2up">Applied electrochemistry</a> (exactly <a rel="nofollow" class="external text" href="https://archive.org/stream/appliedelectroch00thomrich#page/33/mode/1up">Page 33</a>)