3479313 Edison\'s phonometer, 1890; (add.info.: Edison\'s phonometer which measured the mechanical force of sound waves produced by the human voice. From George Bartlett Prescott The electric telephone, New York, 1890.); Universal History Archive/UIG; out of copyright.
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19thcentury19centuryXIXcenturyXIXthcenturycommunicationcommunicationselectricityelectricelectriciteUSAunitedstatesu.s.aunitedstatesofamericaunitesstatesofamericaamericanNorthAmericaAmericahumanpersonhumanforceedisonelectricaltelephonesoundwavesphonometervoicegeorgebartlettprescott1890selectricsoundwavesphonometerforcehumanelectrical19thcenturyelectricityvoicetelephonemechanicalunitedstatescommunicationgeorgebartlettprescottedisonelectricsoundwavesphonometerforcehumanelectrical19thcenturyelectricityvoicetelephonemechanicalunitedstatescommunicationgeorgebartlettprescottedison
1890s1919th19th19thAmericaAmericaNorthUSAXIXXIXthamericaamericaamericanbartlettbartlettbartlettcenturycenturycenturycenturycenturycenturycommunicationcommunicationcommunicationcommunicationsedisonedisonedisonelectricelectricelectricelectricalelectricalelectricalelectriciteelectricityelectricityelectricityforceforceforcegeorgegeorgegeorgehumanhumanhumanhumanmechanicalmechanicalofofpersonphonometerphonometerphonometerprescottprescottprescottsoundsoundsoundstatesstatesstatesstatesstatestelephonetelephonetelephoneu.s.aunitedunitedunitedunitedunitesvoicevoicevoicewaveswaveswaves
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