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Bimetallic Compound Bar pierce brown books She’s messyA compound bar is a device that demonstrates the principle of thermal expansion and contraction, a fundamental concept in thermodynamics. This device was invented by the English clockmaker, John Harrison, as part of his marine chronometer, a navigation device that allowed sailors to determine longitude at sea. The bar consists of two bonded metal plates, one of pure copper and the other of steel. When at the same temperature, they remain straight due