Silvanus Phillips Thompson,
Dictionary of National Biography…
(1912)
“ THOMSON, Sir WILLIAM, first Baron Kelvin of Largs (1824–1907) , man of science and inventor, born on 26 June 1824 in College Square East, Belfast, was second son and fourth child of James Thomson (1786-1849) [q. v.] , professor of mathematics in the Royal Academical Institution of Belfast, by his wife Margaret, eldest daughter of William Gardiner of Glasgow. The elder brother, James (1822-1892) [q. v.] , was professor of engineering, first in Belfast, then in Glasgow. When William was six years old his mother died, and the father himself taught the boys, who never went to school. ”
