Editing 1845 (section)

=== July–September ===
* [[July 26]]–[[August 10]] – [[Isambard Kingdom Brunel]]'s iron [[steamship]] ''[[SS Great Britain|Great Britain]]'' makes the [[transatlantic crossing]] from [[Liverpool]] to New York, the first [[Propeller|screw propelled]] vessel to make the passage.<ref>{{cite book|last=Fox|first=Stephen|year=2003|title=Transatlantic: Samuel Cunard, Isambard Brunel, and the Great Atlantic Steamships|publisher=HarperCollins|isbn=978-0-06-019595-3|url-access=registration|url=https://archive.org/details/transatlanticsam00foxs}}</ref><ref>{{cite web|title=''Great Britain'' |url=http://www.theshipslist.com/pictures/Greatbritain.htm |work=The Ships List |access-date=2010-10-01 |url-status=dead |archive-url=https://web.archive.org/web/20100528131641/http://www.theshipslist.com/pictures/Greatbritain.htm |archive-date=May 28, 2010 }}</ref>
* [[July 28]] – HMS ''Terror'' and HMS ''Erebus'' of the [[Franklin Expedition]] go missing in the [[Davis Strait]] west of [[Greenland]], while searching for the [[Northwest Passage]].
* [[August 4]] – British emigrant [[barque]] ''[[Cataraqui (ship)|Cataraqui]]'' is wrecked on [[King Island (Tasmania)]] with 400 people killed and only 9 survivors.<ref>{{cite news|title=Dreadful Shipwreck! Wreck of the Cataraqui Emigrant Ship, 800 tons|newspaper=Launceston Examiner|page=5|date=1845-09-17|url=http://nla.gov.au/nla.news-article36241486|accessdate=2011-08-21}}</ref>
* [[August 9]] – The [[Aberdeen Act]] is passed by the [[Parliament of the United Kingdom]], empowering the British [[Royal Navy]] to search Brazilian ships, as part of the abolition of the [[Atlantic slave trade|slave trade]] from Africa.
* [[August 19]] – [[List of European tornadoes and tornado outbreaks|A tornado kills 200 people]] in [[France]] at [[Montville, Seine-Maritime|Montville]] while destroying two large factories.
[[File:1845 08 28 Scientific American - Cover page Scientific American, first edition.jpg|150px|thumb|The first issue of ''Scientific American'']]
* [[August 28]] – The journal ''[[Scientific American]]'' begins publication.
* [[September 9]] – [[Potato blight]] breaks out in Ireland,<ref name=CBH>{{cite book|last=Palmer|first=Alan|last2=Palmer |first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=267–268|isbn=0-7126-5616-2}}</ref><ref>{{cite web|title=''Phytophthora infestans''|url=http://www.bbc.co.uk/northernireland/ashorthistory/archive/intro182.shtml|publisher=[[BBC]]|work=A Short History of Ireland|access-date=2012-08-05}}</ref> beginning the [[Great Famine (Ireland)|Great Famine]].
* [[September 18]] – The [[Anglo-French blockade of the Río de la Plata]] is formally declared.
* [[September 25]] – The [[Phi Alpha Literary Society]] is founded, in [[Jacksonville, Illinois]].