To illustrate expansion of metal on heating and contraction on cooling, with steel bar of length 110 x 10 mm and plated brass gauge with a cutout to just accommodate the bar and two holes through which the bar passes when cold.
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To illustrate expansion of metal on heating and contraction on cooling, with steel bar of length 110 x 10 mm and plated brass gauge with a cutout to just accommodate the bar and two holes through which the bar passes when cold.
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