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1855 in science
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==Technology== * August 27 β [[Alphonse Louis Poitevin]] patents the [[collotype]] photographic printing process in France.<ref>{{cite web|url=http://brevetsphotographiques.fr/englishluisnadeau.htm|title=The Poitevin Patents and the Importance of Using Primary Sources|website=BrevetsPhotographiques.fr|archive-url=https://archive.today/20130213104006/http://brevetsphotographiques.fr/englishluisnadeau.htm|archive-date=2013-02-13|access-date=2021-11-23}}</ref> * October 17 β [[Henry Bessemer]] files his [[patent]] for the [[Bessemer process]] of [[steel]]making.<ref>{{cite book|first=Stephen|last=van Dulken|title=Inventing the 19th Century: the great age of Victorian inventions|location=London|publisher=[[British Library]]|year=2001|isbn=978-0-7123-0881-6|pages=30β1}}</ref> * [[William George Armstrong, 1st Baron Armstrong|William Armstrong]] produces the [[Rifled breech-loader|rifled breech-loading]] [[Armstrong Gun]].
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