Editing 1864 in science (section)

==Technology==
* February 17 – In the [[American Civil War]], the tiny [[Confederate States of America|Confederate]] hand-propelled [[submarine]] ''[[H. L. Hunley (submarine)|H. L. Hunley]]'' sinks the [[USS Housatonic (1861)|USS ''Housatonic'']] using a [[spar torpedo]] in [[Charleston Harbor]], becoming the first submarine to sink an enemy ship (although the submarine and her crew of eight are also lost).<ref>{{cite book|title=The H. L. Hunley: the Secret Hope of the Confederacy|first=Tom|last=Chaffin|location=New York|publisher=Hill and Wang|year=2008|isbn=978-0-8090-9512-4|url-access=registration|url=https://archive.org/details/hlhunleysecretho00chaf}}</ref>
* December 8 – The [[Clifton Suspension Bridge]] across the [[River Avon, Bristol|Bristol Avon]] in [[England]], designed by [[Isambard Kingdom Brunel]] and completed as a memorial to him, opens to traffic.<ref>{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}}</ref>
* [[Oriel Chambers]], [[Liverpool]], England, the world's first metal-framed glass [[curtain wall (architecture)|curtain walled]] building, designed by [[Peter Ellis (architect)]], is built.<ref>{{cite web|url=http://www.orielchambers.co.uk/#/411|title=History|publisher=Oriel Chambers|accessdate=2009-07-27|archive-date=2011-02-08|archive-url=https://web.archive.org/web/20110208175443/http://www.orielchambers.co.uk/#/411|url-status=live}}</ref>
* [[Nicolaus Otto]] and [[Eugen Langen]] produce a free piston gas atmospheric engine.
* [[Henry Enfield Roscoe|Henry Roscoe]] and [[Robert Bunsen]] carry out what is reputed to be the first [[Flash (photography)|flashlight photography]], using [[magnesium]] as a light source.<ref>{{cite web|title=Henry Roscoe (1833-1915): flashlight photography|publisher=[[Museum of Science and Industry (Manchester)]]|year=2007|url=http://emu.msim.org.uk/htmlmn/collections/online/browsethemes/relatedobjects_lower.php?irn=2386|accessdate=2011-11-17|archive-url=https://web.archive.org/web/20120302015509/http://emu.msim.org.uk/htmlmn/collections/online/browsethemes/relatedobjects_lower.php?irn=2386|archive-date=2012-03-02|url-status=dead}}</ref>
* Possible date – [[Siegfried Marcus]] builds the first motorized cart, in Vienna.