Editing 1805 in science (section)

==Technology==
* September – [[Sir William Congreve, 2nd Baronet|William Congreve]] first demonstrates the solid-fuel [[Congreve rocket]] for use as an artillery weapon.
* November 26 – The [[Ellesmere Canal]]'s [[Pontcysyllte Aqueduct]] is opened in [[Wales]]; built by [[Thomas Telford]] and [[William Jessop]], its [[cast iron]] trough is {{convert|1007|ft|m|abbr=on}} long and {{convert|126|ft|m|abbr=on}} above the [[River Dee (Wales)|River Dee]] beneath.<ref>{{cite book|first=L. T. C.|last=Rolt|authorlink=L. T. C. Rolt|title=Thomas Telford|url=https://archive.org/details/thomastelford00rolt|url-access=registration|location=London|publisher=Longmans, Green|year=1958}}</ref>