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John Jay (1805–1872) was a building contractor and, earlier, a skilled stonemason, who owned a construction company located in the central City of London within Metropolitan London, England, during the 19th century and its period of rapid civic and railway expansion in the middle of the 19th century. Jay's varied body of works included building the Victorian clock tower and city clock of the British Houses of Parliament after the Westminster Palace had been damaged by a fire in 1833. Jay was also responsible for constructing many smaller architectural projects, such as the notable Abney Park Chapel and the Trinity Independent Chapel.