1833 in science

• November 12–13 – A spectacular occurrence of the Leonid meteor shower is observed over Alabama.

• May 3 – The Entomological Society of London is inaugurated.
• Katherine Sophia Kane's The Irish Flora is published anonymously.

• Thomas Graham proposes Graham's law.

• June 5 – Ada Lovelace is introduced to Charles Babbage by Mary Somerville.{{cite book|first=Anthony|last=Hyman|author-link=R. Anthony Hyman|title=Charles Babbage: Pioneer of the Computer|publisher=Oxford University Press|year=1982|isbn=978-0-19-858170-3|pages=[https://archive.org/details/charlesbabbagepi0000hyma/page/177 177]–8}}

• November 25 – A major 8.7 earthquake strikes Sumatra.

• probable date – Paul Gerwien proves the Bolyai–Gerwien theorem formulated by Farkas Bolyai: that any two simple polygons of equal area are equidecomposable.

• Henry Witham publishes The Internal Structure of Fossil Vegetables found in the Carboniferous and Oolitic deposits of Great Britain in Edinburgh.

• Carl Friedrich Gauss and Wilhelm Eduard Weber develop an electromagnetic telegraph at Göttingen.

• William Beaumont publishes Experiments and Observations on the Gastric Juice and the Physiology of Digestion.
• Charles Bell publishes The Hand: its Mechanism and Vital Endowments as Evincing Design, the fourth Bridgewater Treatise{{Broken anchor|date=2025-03-22|bot=User:Cewbot/log/20201008/configuration|target_link=Natural theology#The Bridgewater Treatises|reason= The anchor (The Bridgewater Treatises) has been deleted.|diff_id=1109937969}}.
• Marshall Hall coins the term "reflex" for a muscular reaction.
• Jean Lobstein proposes use of the term arteriosclerosis.{{cite journal |first1=Alain|last1=Tedgui|first2=Ziad|last2=Mallat |title=Cytokines in Atherosclerosis |url=http://physrev.physiology.org/content/86/2/515.full |journal=Physiological Reviews |publisher=American Physiological Society |year=2006 |volume=86 |issue=2 |pages=515–581 |doi=10.1152/physrev.00024.2005 |accessdate=2011-06-23 |pmid=16601268 |archiveurl=https://web.archive.org/web/20130713133753/http://physrev.physiology.org/content/86/2/515.full |archivedate=2013-07-13|url-status=live}}
• Johannes Peter Müller begins publication of his major physiology textbook Handbuch der Physiologie des Menschen.
• Anselme Payen discovers diastase (the first enzyme identified).

• August 18 – The Canadian ship SS Royal William sets out from Pictou, Nova Scotia on a 25-day passage of the Atlantic Ocean largely under steam to Gravesend, Kent, England.
• Obed Hussey patents a reaper in the United States.{{cite encyclopedia|title=Obed Hussey|encyclopedia=Ohio History Central: An Online Encyclopedia of Ohio History|url=http://www.ohiohistorycentral.org/entry.php?rec=175|date=2005-07-01|accessdate=2011-05-12| archiveurl=https://web.archive.org/web/20110622032502/http://www.ohiohistorycentral.org/entry.php?rec=175| archivedate=22 June 2011 | url-status=live}}{{cite book|title=Obed Hussey, Who, of All Inventors, Made Bread Cheap|editor=Greeno, Follett L.|year=1912|url=http://www.gutenberg.org/files/19547/19547-h/19547-h.htm|accessdate=2011-05-12| archiveurl=https://web.archive.org/web/20130119041803/http://www.gutenberg.org/files/19547/19547-h/19547-h.htm |archivedate=2013-01-19| url-status=live}}
• Cornish engineer Adrian Stephens invents the steam whistle as a warning device at Dowlais Ironworks in Wales.{{cite web|url=http://www.trevor.jones4.btinternet.co.uk/Heroes/AdrianStephens.html |title=Adrian Stephens |accessdate=2012-06-22 |archiveurl=https://web.archive.org/web/20121012000850/http://www.trevor.jones4.btinternet.co.uk/Heroes/AdrianStephens.html |archivedate=2012-10-12 |url-status=dead }}{{cite journal|first=Charles E.|last=Lee|title=Adrian Stephens, inventor of the steam whistle|journal=Transactions of the Newcomen Society|volume=27|year=1949|pages=163–73|doi=10.1179/tns.1949.015 }}
• Publication by Charles Knight of The Penny Cyclopædia of the Society for the Diffusion of Useful Knowledge begins in London.

• Copley Medal: Not awarded{{cite web |title=Copley Medal {{!}} British scientific award |url=https://www.britannica.com/science/Copley-Medal |website=Encyclopedia Britannica |accessdate=22 July 2020 |language=en}}

• January 19 – Alfred Clebsch (died 1872), German mathematician.
• February 26 – Georges Pouchet (died 1894), French comparative anatomist.
• March 14 – Lucy Hobbs Taylor (died 1910), American dentist.
• March 23 – Karl Friedrich Otto Westphal (died 1890), German psychiatrist.
• March 25 – Fleeming Jenkin (died 1885), English electrical engineer.
• May 5 – Ferdinand von Richthofen (died 1905), German geographer.
• June 29 – Peter Waage (died 1900), Norwegian chemist.
• October 9 – Eugen Langen (died 1895), German mechanical engineer.
• October 17 – Paul Bert (died 1886), French physiologist.
• October 21 – Alfred Nobel (died 1896), Swedish inventor.
• November 27 - Émile Vallin (died 1924), French military physician.{{Cite web|language=fr |url=https://cths.fr/an/savant.php?id=4897# |title=Vallin Émile Arthur |author1=L. Vaillard|author2= Agathe Floderer|author3=Alexandre Wauthier |website=cths.fr |publisher= Comité des travaux historiques et scientifiques |access-date=11 February 2021}}
• December 2 – Friedrich Daniel von Recklinghausen (died 1910), German pathologist.

• January 10 – Adrien-Marie Legendre (born 1752), mathematician.
• February 6
• Fausto Elhuyar (born 1755), chemist
• Pierre André Latreille (born 1762), zoologist.
• February 14 – Gottlieb Kirchhoff (born 1764), chemist.
• April 22 – Richard Trevithick (born 1771), engineer and inventor.
• May 15 – Bewick Bridge (born 1767), mathematician.
• July 5 – Nicéphore Niépce (born 1765), inventor.
• October 31 – Johann Friedrich Meckel (born 1781), anatomist.

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Category:19th century in science

Category:1830s in science