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Day 2: 24 days of Thinktank exhibits Step back into the early days of electric power. This incredible machine is a mercury-arc rectifier, built by the Electric Construction Company of Wolverhampton. Long before modern electronics, devices like this were used to convert AC to DC, powering heavy industrial motors, tramways, workshops, and early electrical systems. This particular machine was built in 1890 for use in a factory. Inside its glass chamber sat a shimmering pool of liquid mercury. When