François Arago
Who was François Arago?
French mathematician, physicist, astronomer and politician (1786-1853)
Biographical data adapted from Wikipedia’s article on François Arago (CC BY-SA 4.0).
Biography
Dominique François Jean Arago was born on February 26, 1786, in Estagel, a small town in the Pyrénées-Orientales department of southern France, where there are strong Catalan cultural ties. He had a natural talent for mathematics from a young age and was accepted into the École Polytechnique in Paris, where he studied with some of the top scientists of the Napoleonic era. His academic skills soon caught the eye of key figures in French science, and he became the secretary of the Paris Observatory in his early twenties.
Before Fame
François Arago grew up in Estagel in a family without much wealth during a time when revolutionary France was revamping its schools and scientific organizations. The recently created grandes écoles, especially the École Polytechnique, aimed to train a top group of scientists and engineers based on merit, and Arago's outstanding math skills got him into this system. His teachers noticed his talent right away, and he connected with top mathematicians and physicists like Pierre-Simon Laplace and Siméon Denis Poisson, who influenced his approach to science.
Key Achievements
- Discovered rotary magnetism, demonstrating that a rotating copper disc deflects a magnetic needle, contributing foundational observations to the science of electromagnetism
- Collaborated with Fresnel on experiments that provided strong evidence for the wave theory of light, including work on polarization and diffraction
- Announced and championed the daguerreotype process to the world in 1839, securing its public release without patent restrictions
- Abolished slavery in French colonies through a ministerial decree issued during his tenure as Minister of the Navy in 1848
- Completed meridian arc measurements that refined the definition of the metre, despite imprisonment during the Peninsular War
Did You Know?
- 01.Arago was captured by Spanish forces during the Peninsular War while conducting geodetic surveys and was held in a Moorish fortress before eventually escaping and making his way back to France via Algiers and Marseille.
- 02.He played a central role in the public announcement of the daguerreotype in 1839, persuading the French government to purchase the invention and release it to the world without patent restrictions.
- 03.As Minister of the Navy in 1848, Arago signed the decree that definitively abolished slavery throughout the French colonial empire, fulfilling an ambition that French abolitionists had pursued for decades.
- 04.Arago discovered that a rotating non-magnetic metal disc could cause a suspended magnetic needle to rotate with it, a phenomenon later explained by Faraday as a consequence of electromagnetic induction.
- 05.He was awarded the Copley Medal by the Royal Society in 1825 and the Rumford Medal in 1850, making him one of a small number of scientists to receive two of the society's most prestigious honours.
Family & Personal Life
Awards & Honors
| Award | Year | Details |
|---|---|---|
| Copley Medal | 1825 | — |
| Pour le Mérite for Sciences and Arts order | 1842 | — |
| citizen of Edinburgh | 1834 | — |
| Rumford Medal | 1850 | — |
| Order of the Cross of July | — | — |
| Honorary Fellow of the Royal Society of Edinburgh | 1815 | — |
| Fellow of the American Academy of Arts and Sciences | 1832 | — |
| Foreign Member of the Royal Society | 1818 | — |
| Knight of the Legion of Honour | 1818 | — |
| Officer of the Legion of Honour | 1825 | — |
| Commander of the Legion of Honour | 1837 | — |
| Grand Officer of the Legion of Honour | 1849 | — |
| 72 names on the Eiffel Tower | — | — |
| Officer of the Order of Leopold | 1841 | — |