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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technology.ieo on Instagram: "They don’t make them like this anymore - because they literally can’t. Inside this 102-year-old elevator control cabinet sits a glowing relic of early electrical engineering: a mercury arc rectifier. This device converts AC to DC using a pool of liquid mercury and an arc discharge - tech before modern semiconductors even existed. Invented in the early 1900s, mercury arc rectifiers once powered industrial motors, heavy equipment, and railway systems. That eerie blue
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The Master Key on Instagram: "They don't make them like this anymore - because they literally can't. Inside this 102-year-old elevator control cabinet sits a glowing relic of early electrical engineering: a mercury arc rectifier. This device converts AC to DC using a pool of liquid mercury and an arc discharge - technology from before modern semiconductors even existed. Invented in the early 1900s, mercury arc rectifiers once powered industrial motors, heavy equipment, and railway systems worldw
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