Paul Langevin's Ultrasonic Breakthroughs for Submarine Detection

Paul Langevin

A French physicist. He conducted research on paramagnetism, diamagnetism, Brownian motion, ultrasonics, and electromagnetism, leaving his name on terms such as the Langevin equation and the Langevin function. He began his research as a student of Pierre Curie and also studied at the Cavendish Laboratory at the University of Cambridge. During World War I, he worked on developing submarine detection technology using ultrasound, and after the war, he promoted Einstein's theory of relativity within the French academic community. Active in anti-fascist and anti-Nazi movements, he was dismissed from his position and placed under house arrest by the Vichy regime during World War II. After the war, he served as president of the French Human Rights League, and his remains were transferred to the Panthéon in 1948.

Timeline

Category
Element

Year	Paul Langevin
1872	Birth of Paul Langevin (Period: January 23, 1872, Location: Paris, France)
1888	Studies at the École de Physique et de Chimie (Age: 15 years old, Period: 1888–1891, Location: Paris, France)
1893	Admission to the École Normale Supérieure (Paul Langevin, Age: 20 years old, Period: 1893–1897, Location: Paris, France)
1897	Research at the Cavendish Laboratory (Age: 24 years old, Period: 1897–1898, Location: Cambridge, United Kingdom)
1898	Marriage (Paul Langevin, Emma Jeanne Desfosses, Age: 26 years old, Period: September 22, 1898, Location: Choisy-le-Roi, France)
1900	Introduction and popularization of the theory of relativity in France (Age: 27 years old, Period: 1900s–1920s, Location: France, centered around Paris)
1902	Doctoral thesis "Researches on Ionized Gases" (Age: 29 years old, Period: 1902, Location: Paris, France)
1904	Appointment as Professor at the Collège de France (Paul Langevin, Age: 31 years old, Period: 1904, Location: Paris, France)
1914	World War I (Age: 41 years old, Period: 1914–1918, Location: Europe, Middle East, and Africa) Research on submarine detection using ultrasound (Age: 41 years old, Period: 1914–1918, Location: France)
1926	Appointment as Director of ESPCI (Paul Langevin, Age: 53 years old, Period: 1926, Location: Paris, France)
1930	Activities as an anti-fascist intellectual (Age: 57 years old, Period: 1930s, Location: Paris, France)
1934	Formation of the Vigilance Committee of Anti-Fascist Intellectuals (Age: 61 years old, Period: 1934, Location: Paris, France) Election as a member of the French Academy of Sciences (Age: 61 years old, Period: 1934, Location: Paris, France)
1939	World War II (Age: 66 years old, Period: 1939–1945, Location: UK, France, Atlantic, North Africa, Mediterranean, and Europe)
1940	Dismissal and house arrest by the Vichy regime (Age: 67 years old, Period: 1940–1944, Location: France)
1944	Return to public service after World War II (Age: 71 years old, Period: 1944, Location: Paris, France) Joining the French Communist Party and post-war activities (Age: 71 years old, Period: 1944–1946, Location: Paris, France)
1946	Death of Paul Langevin (Age: 74 years old, Period: December 19, 1946)

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Europe World

Group	List
French Politics	Raymond Poincaré Georges Clemenceau René Viviani Alexandre Millerand Aristide Briand Joseph Caillaux
British Politics	Herbert Henry Asquith David Lloyd George Horatio Herbert Kitchener Andrew Bonar Law Winston Leonard Spencer Churchill Andrew Bonar Law
Poet and Writer	Wilfred Owen Siegfried Sassoon Rupert Brooke Isaac Rosenberg Robert Graves Henri Barbusse Romain Rolland
Science and Medicine	Marie Curie Ernest Rutherford Paul Langevin Charles de Lorme Alexis Carrel

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Paul Langevin's Ultrasonic Breakthroughs for Submarine Detection

Paul Langevin

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