Editing 1820 in science (section)

==Technology==
* July 26 – Opening of [[Union Bridge (Tweed)|Union Chain Bridge]] across the [[River Tweed]] between [[England]] and [[Scotland]], designed by [[Captain Samuel Brown]]. Its span of 449&nbsp;ft (137 metres) is the longest in the [[Western world]] at this time, and it is the first [[wrought iron]] vehicular [[suspension bridge]] of its type in [[United Kingdom of Great Britain and Ireland|Britain]].<ref>{{cite book|url=https://archive.org/details/amemoirsuspensi01drewgoog|title=A Memoir of Suspension Bridges: Comprising The History Of Their Origin And Progress|chapter=Section III|last=Drewry|first=Charles Stewart|year=1832|publisher=Longman, Rees, Orme, Brown, Green & Longman|location=London|pages=[https://archive.org/details/amemoirsuspensi01drewgoog/page/n55 37]–41|accessdate=2011-08-16}}</ref>
* [[English people|English]] inventor [[Thomas Hancock (inventor)|Thomas Hancock]] [[patent]]s the production of fastenings using rubberized fabrics and invents the "pickling machine" (masticator) for recycling [[rubber]] scraps.
* [[French people|French]] engineer [[Jean-Victor Poncelet]] develops an inward-flow [[water turbine]].