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1792 in science
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==Technology== * April 25 β First use of the [[guillotine]]. * [[Claude Chappe]] successfully demonstrates the first [[semaphore line]], between [[Paris]] and [[Lille]], constituting an optical [[telegraph]]. * [[William Murdoch]] invents gas lighting. * George Anschutz constructs the first [[blast furnace]] in [[Pittsburgh, Pennsylvania]]. * [[James Rumsey]] is granted a [[patent]] for a [[water turbine]], in [[England]].<ref>British patent no. 1903</ref> * The first iron-cased [[Mysorean rockets]] are successfully developed and used by [[Hyder Ali]] and his son [[Tipu Sultan]], rulers of the [[Kingdom of Mysore]] in [[India]], against [[British East India Company]] forces during the [[Anglo-Mysore Wars]].
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