3479996 Wheatstone\'s needle (pointer) telegraph, 1890; (add.info.: Wheatstone\'s needle (pointer) telegraph; the sender; left and receiver, 1890.); Universal History Archive/UIG; out of copyright.
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TOP27536703
Source:
達志影像
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RM
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須由TPG 完整授權
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19thcentury19centuryXIXcenturyXIXthcenturyalphabetmessagemessagesmessengercommunicationcommunicationstelegraphtelegraphylettersneedlegalvanometerrelayoperatorlongdistancewheatstonecookeelectromagnetichandlescombinedmovementsconventionalsignalsoperator1890salarmbellmessageswheatstonetelegraphyrelaylettershandlestelegraphmanipulating19thcenturycombinedmovementsneedleelectromagneticcookeconventionalsignalsgalvanometerlongdistancealphabet1890salarmbellmessageswheatstonetelegraphyrelaylettershandlestelegraphmanipulating19thcenturycombinedmovementsneedleelectromagneticcookeconventionalsignalsgalvanometerlongdistancealphabet
1890s1890s1919th19th19thXIXXIXthalarmalarmalphabetalphabetalphabetbellbellcenturycenturycenturycenturycenturycenturycombinedcombinedcombinedcommunicationcommunicationsconventionalconventionalconventionalcookecookecookedistancedistancedistanceelectromagneticelectromagneticelectromagneticgalvanometergalvanometergalvanometerhandleshandleshandlesletterslettersletterslonglonglongmanipulatingmanipulatingmessagemessagesmessagesmessagesmessengermovementsmovementsmovementsneedleneedleneedleoperatoroperatorrelayrelayrelaysignalssignalssignalstelegraphtelegraphtelegraphtelegraphytelegraphytelegraphywheatstonewheatstonewheatstone