What material is used to make the heavy frame that supports the immense tension of a piano's strings?
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The immense tension of a piano's strings, which can exceed 20 tons in a grand piano, is supported by a heavy frame made of cast iron. Invented in the 19th century, this iron plate prevented the wooden body of the piano from warping or collapsing under pressure. This crucial innovation allowed pianos to have thicker strings and a much louder, more resonant sound. Photo: Gryffindor, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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