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1805 in science
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==Deaths== * January 23 – [[Claude Chappe]], [[French people|French]] inventor of the mechanical [[semaphore line|semaphore system]] (born [[1763 in science|1763]]) * February 17 – [[Josephus Nicolaus Laurenti]], [[Vienna|Viennese]] [[herpetologist]] (born [[1735 in science|1735]]) * May 16 – [[Christiaan Brunings]], [[Netherlands|Dutch]] [[hydraulic engineer]] (born [[1736 in science|1736]]) * July 2 – [[Patrick Russell (herpetologist)|Patrick Russell]], Scottish-born surgeon and herpetologist (born [[1726 in science|1726]]) * December 23 ** [[Geneviève Thiroux d'Arconville]], French novelist, translator and chemist (born [[1720 in science|1720]]) ** [[Pehr Osbeck]], Swedish botanist and explorer, pupil of [[Carl Linnaeus|Linnaeus]] (born [[1723 in science|1723]])
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