That eerie blue glow is a mercury arc rectifier firing an electrical arc through mercury vapor. Once the arc ignites, the mercury becomes plasma and creates a conductive path that forces electricity to flow in one direction. Its job is converting AC power into DC, which was critical for older machinery that relied on DC motors. Many early elevator systems used DC drive setups, so buildings installed rectifiers like this to make their elevator motors work off standard incoming AC power. Invented
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