... not only add, but could also multiply. It was not until 1820 that a mechanical calculator, developed by Charles Xavier Thomas, was introduced that could perform all four basic arithmetic operations. While Thomas was busy creating the desktop calculator, Charles Babbage (a mathematics professor in Cambridge, England), began to design a more complex machine. In 1822, with financial help ... from the British government, Babbage demonstrated a working model of the Difference Engine. Though having limited adaptability and applicability, Babbage's mechanical design was wholly automatic, comman...

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