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Final answer:During the Industrial Revolution, mill construction buildings had columns and beams typically made of heavy timber and iron, materials that provided the strength needed for larger machines and improved fire resistance.Explanation:The columns and beams in mill construction buildings during the Industrial Revolution were typically made of heavy timber and iron. This was a period marked by architectural advancements that leveraged new materials like iron and steel, which were integral to the construction of more substantial and fireproof buildings.Although wood has been a common building material throughout history, it was during the Industrial Revolution that Charles Bage first introduced a mill design using cast iron and brick, significantly enhancing the strength of the structure.Eaton Hodgkinson further developed the use of iron in building by introducing the section beam in the early 1830s, which became widely used in construction....