Lawyer and physicist, burn at Swansea; called to the bar; was made a judge in 1871, and knighted a year later, and from 1875 to 1887 he was one of the judges in the High Court of Justice; throughout his life he busied himself in optical and electrical research; in 1839 invented the electric battery named after him, and from 1840 to 1847 lectured on Natural Science in the London Institution; in 1866 he was President of the British Association; his scientific publications are various, and are important contributions to their subjects (1811-1896).