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1817 in science
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==Technology== * March β [[Ackermann steering geometry]] invented by [[Georg Lankensperger]]. * June 12 β German inventor [[Karl Drais]] drives his [[dandy horse]] ("Draisine" or ''Laufmaschine''), the earliest form of [[bicycle]], in [[Mannheim]]. * July 10 β [[David Brewster]] [[patent]]s the [[kaleidoscope]].<ref>British patent no. 4136. {{cite web|url=http://www.brewstersociety.com/brewster_patent.pdf |title=Brewster Patent |accessdate=2011-05-31 |url-status=dead |archiveurl=https://web.archive.org/web/20110721020838/http://www.brewstersociety.com/brewster_patent.pdf |archivedate=2011-07-21 }}</ref>
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