1831-1879. Scottish physicist. His major achievement was in the understanding of electromagnetic waves: Maxwell's equations bring together electicity, magnetism, and light in one set of relations. He contributed to every branch of physical science - gases, optics, and colour sensation. His theoretical work in magnetism prepared the way for wireless telegraphy and telephony. Born in Edinburgh, he was professor of natural philosophy at Aberdeen 1856-60, and then of physics and astronomy at London. In 1871, he became professor of experimental physics at Cambridge. His principal works include Perception of Colour, Colour Blindness 1860, Theory of Heat 1871, Electricity and Magnetism 1873, and Matter and Motion 1876. His principal works include Perception of Colour 1860, Theory of Heat 1871, Electricity and Magnetism 1873, and Matter and Motion 1876.