Lord Kelvin (1824 - 1907) was born William Thomson in Belfast and was one of the leading physicists and greatest teachers of his time. In 1824, Kelvin proposed the absolute scale of temperature that still bears his name. He also made significant contributions to the fields of electricity and magnetism. Among the devices he invented or improved were a tide predictor, a harmonic analyzer, and an apparatus for taking soundings in shallow and deep waters. He also redesigned the mariner's compass. Kelvin was knighted in 1866 and was raised to the peerage with the title of Baron Kelvin of Largs in 1892.

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