eng. wis- en natuurkundige, geb. 1831, prof, te Belfast, later te Edinburg; schreef: Natural philosophy (met W. Thomson, 1867), Lectures on some recent advances in physical science (3de dr., 1885), Elementary treatise on quaternions (2de dr., 1874), Treatise on dynamics of a particle (met Steele, 6de dr., 1889), Light (2de dr., 1889), Heat (3de dr., 1892), The unseen univers (met B.
Stewart, 17de dr., 1890), Scientific Papers (dl. I, 1899), enz.
