Sandfingers - Mercury Arc Rectifier

Command To Destroy
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A mercury-arc rectifier is a type of electrical device used for converting high-voltage or high-current alternating current (AC) into direct current (DC).

This one in particular was photographed by Richard from Sandfingers at the Isle of Man Electric Railway. It's quite simply the most beautiful thing. Here’s a video of it... I then treated the photos adding suitable noise, colour and shapes.