Rudolf Kohlrausch

Rudolf Hermann Arndt Kohlrausch (November 6, 1809 in Göttingen – March 8, 1858 in Erlangen) was a German physicist.

He was a native of Göttingen, the son of the Royal Hanovarian director general of schools Friedrich Kohlrausch.

He was a high-school teacher of mathematics and physics successively at Lüneburg, Rinteln, Kassel and Marburg.

[2][3] In an 1855 experiment (published 1857) with Wilhelm Weber (1804–1891), he demonstrated that the ratio of electrostatic to electromagnetic units produced a number similar to the value of the speed of light,[4] a constant which they named

[5] This finding was instrumental towards Maxwell's conjecture that light is an electromagnetic wave.