Editing 1840 (section)

=== July–September ===
[[File:RMS Britannia 1840 paddlewheel.jpg|thumb|right|[[July 4]]: {{RMS|Britannia}}]]
* [[July 4]] – The [[Cunard Line]]'s 700-[[ton]] wooden paddlewheel steamer {{RMS|Britannia}} departs from [[Liverpool]], bound for [[Halifax, Nova Scotia]], on the first steam transatlantic passenger mail service.<ref>{{cite book|last=Palmer|first=Alan|last2=Palmer |first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=263–264|isbn=0-7126-5616-2}}</ref>
* [[July 15]] – The [[Austrian Empire]], the [[United Kingdom of Great Britain and Ireland|United Kingdom]], the [[Kingdom of Prussia]] and the [[Russian Empire]] sign the [[Convention of London (1840)|Convention of London]] with the [[Sublime Porte]], ruler of the [[Ottoman Empire]].
* [[July 21]] – [[August Borsig]]'s [[steam locomotive]], the first built in [[German Confederation|Germany]], competes against a [[George Stephenson|Stephenson]]-built locomotive on the [[Anhalt Railway|Berlin–Jüterbog railroad]]; the Borsig locomotive wins by 10 minutes.
* [[July 23]]
** [[Pedro II of Brazil|Pedro II]] is declared "of age" prematurely, and begins to reassert central control in [[Empire of Brazil|Brazil]].
** The [[Province of Canada]] is created by the [[Act of Union 1840|Act of Union]], but not proclaimed until 10 February 1841.
* [[August 1]] – Remaining former slaves in the [[British Empire]] are released from apprenticeships under terms of the [[Slavery Abolition Act 1833]].
* [[August 10]] – [[Fortsas hoax]]: A number of book collectors gather in [[Binche]], Belgium, to attend a non-existent book auction of the late "Count of Fortsas".
* [[August 19]] – The [[Battle of the Barrier]].
* [[September 10]] – Ottoman and British troops bombard [[Beirut]], and land troops on the coast, to pressure [[Egypt Eyalet|Egypt]]ian Muhammad Ali to retreat from the country.
* [[September 16]] – [[Joseph Strutt (philanthropist)|Joseph Strutt]] hands over the deeds and papers concerning the [[Derby Arboretum]], which is to become England's first public park.
* [[September 30]] – The French frigate [[French ship Belle Poule (1834)|''Belle-Poule'']] arrives in Cherbourg, bringing back the remains of [[Napoleon]] from [[Saint Helena]] to [[July Monarchy|France]].