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Explaining The Universe on Instagram: "In the 1930s, many early automatic elevators used mercury relays as part of their control and floor-selection systems. A mercury relay was a sealed glass tube with a small pool of liquid mercury that acted as the electrical contact. When the tube was tilted or an internal coil pulled a contact down, the mercury flowed to touch different electrodes, completing or breaking circuits. Because mercury is a smooth, conductive liquid, these relays produced quiet,
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