THOMSON, SIR WILLIAM, LORD KELVIN, great physicist, born at Belfast; studied at St. Peter’s College, Cambridge; was senior wrangler in 1845, and elected professor of Natural Philosophy in Glasgow in 1846; it is in the departments of heat and electricity he has accomplished his greatest achievements, and his best-known work is the invention of the siphon-recorder for the Atlantic cable, on the completion of which, in 1866, he was knighted, to be afterwards raised to the peerage in 1892; he has invented a number of ingenious and delicate scientific instruments, as well as written extensively on mathematical and physical subjects; b. 1824.

THOR, in the Norse mythology “the god of thunder; the thunder was his wrath, the gathering of the black clouds is the drawing down of Thor’s angry brows; the fire-bolt bursting out of heaven is the all-rending hammer flung from the hand of Thor; he urges his loud chariot over the mountain tops—­that is the peal; wrathful he ’blows in his beard’—­that is the rustling of the storm-blast before the thunder begin”; he is the strongest of the gods, the helper of both gods and men, and the mortal foe of the chaotic powers.

THOREAU, HENRY DAVID, an American author who, next to his friend and neighbour Emerson, gave the most considerable impulse to the “transcendental” movement in American literature, born in Concord, where his life was mostly spent, of remote French extraction; was with difficulty enabled to go to Harvard, where he graduated, but without distinction of any sort; took to desperate shifts for a living, but simplified the problem of “ways and means” by adopting Carlyle’s plan of “lessening your denominator”; the serious occupation of his life was to study nature in the woods around Concord, to make daily journal entries of his observings and reflections, and to preserve his soul in peace and purity; his handicrafts were unwelcome necessities thrust upon him; “What after all,” he exclaims, “does the practicalness of life amount to?  The things immediate to be done are very trivial; I could postpone them all to hear this locust sing.  The most glorious fact in my experience is not anything I have done or may hope to do, but a transient thought or vision or dream which I have had”; his chief works are “Walden,” the account of a two years’ sojourn in a hut built by his own hands in the Concord Woods near “Walden Pool,” “A Week on the Concord and Merrimac River,” essays, poems, etc. (1817-1862).

THORN (27), a town and fortress of the first rank in West Prussia, on the Vistula, 115 m.  NW. of Warsaw; formerly a member of the HANSEATIC LEAGUE (q. v.); was annexed by Prussia in 1815; the birthplace of Copernicus; carries on a brisk trade in corn and timber.

THORNBURY, GEORGE WALTER, a miscellaneous writer, author of numerous novels, “Songs of the Cavaliers and Roundheads,” “Life of Turner,” “Old and New London,” etc.; born in London, where his life was spent in literary work (1828-1876).