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1831 in science
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==Technology== * April 12 β [[Broughton Suspension Bridge]] over the [[River Irwell]] in [[England]] [[List of bridge failures#Bridge failures|collapses]] under marching troops.<ref>{{cite book|first=R.E.D.|last=Bishop|title=Vibration|edition=2nd|publisher=Cambridge University Press|year=1979|isbn=0-521-22779-8}}</ref> * August 29 β [[Michael Faraday]] demonstrates [[electromagnetic induction]] at the [[Royal Society]] of London.<ref>{{cite web|url=http://www.icons.org.uk/theicons/icons-timeline/1820-1840 |title=Icons, a portrait of England 1820-1840 |accessdate=2007-09-12 |archiveurl=https://web.archive.org/web/20070922055840/http://www.icons.org.uk/theicons/icons-timeline/1820-1840 |archivedate=22 September 2007 |url-status=dead }}</ref> [[Joseph Henry]] recognises it at about the same time. * October 28 β Faraday develops the [[Faraday Wheel]], a [[homopolar generator]].<ref name="Pocket On This Day">{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}}</ref> * [[Joseph Henry]] invents the [[electric bell]].<ref>{{cite book|title=Scientific writings of Joseph Henry|volume=30 |issue=2|url=https://books.google.com/books?id=w6cKAAAAIAAJ&q=%22joseph+henry%22+%22i+arranged+around+one+of+the+upper+rooms%22&pg=PA434|page=434|year=1886|publisher=[[Smithsonian Institution]]|location=Washington, D.C.}}</ref> * [[James Meadows Rendel (engineer)|James Meadows Rendel]] erects the first [[bascule bridge]] with a [[hydraulic]] mechanism, on the [[Kingsbridge Estuary]] in England.<ref>{{cite web|first=Mike|last=Clarke|title=A Brief History of Movable Bridges|url=http://www.mikeclarke.myzen.co.uk/Movable%20Bridges.html|date=2009-01-05|accessdate=2012-02-09}}</ref> * [[William Wallace (mathematician)|William Wallace]] invents the [[eidograph]].<ref>{{cite book|last1=Waterston|first1=Charles D.|last2=Shearer|first2=A. Macmillan|title=Former Fellows of the Royal Society of Edinburgh 1783-2002: Biographical Index|url=http://www.rse.org.uk/cms/files/fellows/biographical_index/fells_indexp2.pdf|accessdate=2012-01-23|volume=2|page=964 |publisher=[[Royal Society of Edinburgh]]|isbn=978-0-902198-84-5 |date=July 2006}}</ref>
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