Henri Abraham

Henri Abraham (1868–1943) was a French physicist who made important contributions to the science of radio waves. He performed some of the first measurements of the propagation velocity of radio waves, helped develop France's first triode vacuum tube, and with Eugene Bloch invented the astable multivibrator.

Henri Abraham was born July 12, 1868 in the 1st arrondissement of Paris . After brilliant studies at Chaptal secondary school, from 1886 to 1889 he pursued scientific graduate studies at the École Normale Supérieure, where he attended the lectures of physics professors Jules Violle and Marcel Brillouin, and the Faculty of Paris, where he studied physics with Gabriel Lippmann and Edmond Bouty and obtained degrees in physical sciences and in mathematical sciences. He was then appointed for one year preparer physics laboratory of the Ecole Normale Superieure, then led by Jules Violle, where he wrote his thesis for the doctorate in physical sciences: "New determination of the ratio between electromagnetic and electrostatic units", which he received in 1892. He served as professor at Chaptal College (November 1890 - September 1894), then at the Lycée Louis-le-Grand (September 1894 -November 1900) .

Lecturer at the Ecole Normale Supérieure from 1897 (1899-1900 3rd year), he was appointed lecturer in physics in November 1900, then the conferences second year with Marcel Brillouin, then it supports the Conferences 1st year. He also succeeded Jules Violle as director of the physics laboratory of the school. He served as director of the laboratory at the Ecole Pratique des Hautes Etudes from 1904 to 1905. After the annexation of the Ecole Normale Supérieure by the University of Paris, he was appointed on 1 November 1904 Lecturer of Physics at the Faculty of Paris, delegate to the Ecole Normale Supérieure, then professor of physics in 1912. He served a term as exchange professor to Brazil in 1922. He retired in October 1937, when he received an honorary award. Eugene Bloch succeeded him as director of the physics laboratory, while Pierre Auger was his successor for physics conferences.

He was Secretary General of the French Physical Society from 1900 to 1912 and its President in 1922. With General Ferrie, he founded the League of Radioélectriciens in 1921, and succeeded him as president in 1934. He was also president of the Society of clotting France in 1932, and in 1934 Secretary General of the International Union of Pure and Applied Physics .

...
Wikipedia