Editing 1803 in science (section)

==Transport==
* January 4 – [[William Symington]] demonstrates his ''[[Charlotte Dundas]]'', the "first practical steamboat", in [[Scotland]].
* July 26 – The [[Surrey Iron Railway]], a [[wagonway]] between [[Wandsworth]] and [[Croydon]], is opened, being the first public railway line in England.
* [[Thomas Telford]] begins work on construction of the [[Caledonian Canal]] and improving roads in Scotland.<ref>{{cite book|last=Williams|first=Hywel|title=Cassell's Chronology of World History|url=https://archive.org/details/cassellschronolo0000will/page/354|url-access=registration|location=London|publisher=Weidenfeld & Nicolson|year=2005|isbn=0-304-35730-8|page=[https://archive.org/details/cassellschronolo0000will/page/354 354]}}</ref><ref>{{cite book|last1=Palmer|first1=Alan|last2=Palmer|first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=239–240|isbn=0-7126-5616-2}}</ref>