Lord Kelvin , Scottish engineer, physicist and mathematician, c 1900.

UNITED KINGDOM - JULY 03: Lord Kelvin (1824-1907) was Professor of Natural Philosophy (Physics) at the University of Glasgow for 53 years. Kelvin was born William Thomson and was educated at Glasgow and Cambridge. Kelvin was a pioneer of thermodynamics and electromagnetic theory. He also invented the mirror galvanometer and the siphon recorder, for sending and receiving signals, and directed work on the first successful transatlantic cable telegraph (completed in 1866), which brought him considerable wealth. He was knighted in 1866, and created a peer, Baron Kelvin of Largs, in 1892. (Photo by SSPL/Getty Images)