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Hace 4 días · 1st century AD: The aeolipile, a simple steam turbine is recorded by Hero of Alexandria. [263] 1st century AD: The first use of respiratory protective equipment is documented by Pliny the Elder ( c. 23 AD –79) using animal bladder skins to protect workers in Roman mines from red lead oxide dust.
Hace 3 días · The scattered insurgents formed guerrilla bands. In 1820, the Spanish royal army brigadier Agustín de Iturbide changed sides and proposed independence, issuing the Plan of Iguala. Iturbide persuaded insurgent leader Vicente Guerrero to join this new push for independence.
30 de abr. de 2024 · Charles Xavier Thomas de Colmar was a French mathematician. In 1820, while serving in the French army, he built his first arithmometer, which could perform basic addition, subtraction, multiplication, and division. The first mechanical calculator to gain widespread use, it became a commercial.
Hace 3 días · 1820 Savannah yellow fever epidemic 1820 Savannah, Georgia, United States Yellow fever: 700 1821 Barcelona yellow fever epidemic 1821 Barcelona, Spain Yellow fever: 5,000–20,000 Second cholera pandemic: 1826–1837 Asia, Europe, North America Cholera: 100,000+ 1828–1829 New South Wales smallpox epidemic 1828–1829
Hace 1 día · George III (George William Frederick; 4 June 1738 – 29 January 1820) was King of Great Britain and Ireland from 25 October 1760 until his death in 1820. The Acts of Union 1800 unified Great Britain and Ireland into the United Kingdom of Great Britain and Ireland, with George as its king.
Hace 3 días · Concepción Arenal, nacida el 31 de enero de 1820 en Ferrol (Galicia), se enfrentó a las convenciones de su tiempo y dedicó muchas de sus energías a defender a las personas más desfavorecidas.
Hace 4 días · 1820: Discovery of Antarctica. 1820: Liberia founded by the American Colonization Society for freed American slaves. 1820: Dissolution of the Maratha Empire. 1821–1823: First Mexican Empire, as Mexico's first post-independence government, ruled by Emperor Agustín I of Mexico.
