102-Year-Old Electrical Tech Still Glows Inside an Elevator ⚡🔵
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Inside this 102-year-old elevator control cabinet sits a glowing relic of early electrical engineering: a mercury arc rectifier. This device was built to convert alternating current (AC) into direct current (DC) using a pool of liquid mercury and an arc discharge — long before modern semiconductors existed. Invented in the early 1900s ...
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