William Thomson, 1st Baron Kelvin

Definition and stakes

Portrait of Silvanus Phillips Thompson 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. ”
Source: Wikisource

William Garnett and Hugh Munro Ross,  1911 Encyclopædia Britannica (1911)

“ To follow him in his flights is real mental exhilaration.”
In 1852 Thomson married Margaret, daughter of Walter Crum of Thornliebank, who died in 1870; and in 1874 he married Frances Anna, daughter of Charles R. Blandy of Madeira. In 1866, perhaps chiefly in acknowledgment of his services to trans-Atlantic telegraphy, Thomson received the honour of knighthood, and in 1892 he was raised to the peerage with the title of Baron Kelvin of Largs. The Grand Cross of the Royal Victorian Order was conferred on him in 1896, the year of the jubilee of his professoriate.
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Source: Wikisource

Various,  Popular Science Monthly (1902)

“ Even a man as great as Huxley was obviously pleased at being made a privy councilor and being granted an audience with the Queen. Sir William Thomson was willing to give up the name of his father, himself a professor of mathematics, to become Lord Kelvin, even though he has no heir. ”
Source: Wikisource

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