Telegraph Sounder and Speaking Telephone
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History"}, "indexedStructured": {"date": ["1870s"], "object_type": ["telegraph sounder", "Patents", "Telephones", "telegraph sounder; Telephones", "telegraph receiver", "Models"], "name": ["Dolbear, Amos E."], "topic": ["Communications", "Telegraph Sounders"], "online_media_type": ["Images"]}, "freetext": {"setName": [{"label": "See more items in", "content": "Work and Industry: Electricity"}, {"label": "See more items in", "content": "Communications"}, {"label": "See more items in", "content": "Telegraph Sounders"}], "date": [{"label": "date made", "content": "1879"}], "identifier": [{"label": "ID Number", "content": "EM.252631"}, {"label": "catalog number", "content": "252631"}, {"label": "accession number", "content": "49064"}, {"label": "patent number", "content": "220205"}], "notes": [{"label": "Description (Brief)", "content": "Telegraph sounders convert electrical pulses into audible sounds and are used to receive Morse code messages. The message travels as a series of electrical pulses through a wire. Short pulses make a dot, slightly longer pulses make a dash. The sequence of dots and dashes represent letters and numbers. The pulses energize the sounder\u00e2\u0080\u0099s electromagnets which move a lever-arm. The arm makes a loud \u00e2\u0080\u009cclick\u00e2\u0080\u009d when it strikes a crossbar and the operator translates the pattern of sounds into the original language. Inventor Amos Dolbear, known for his early experiments in telephony, made this patent model of a combination device that worked both as a telegraph sounder and a telephone receiver."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "maker", "content": "Dolbear, Amos E."}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "metal (overall material)"}, {"label": "Physical Description", "content": "rubber (overall material)"}, {"label": "Physical Description", "content": "cloth (overall material)"}, {"label": "Measurements", "content": "overall: 4 1/4 in x 4 1/2 in x 4 1/4 in; 10.795 cm x 11.43 cm x 10.795 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "patent model"}, {"label": "Object Name", "content": "telegraph receiver"}, {"label": "Object Name", "content": "telephone"}, {"label": "Object Name", "content": "telegraph sounder"}, {"label": "Object Type", "content": "Patent Model"}, {"label": "Other Terms", "content": "telegraph sounder; Telephones"}]}}, "url": "edanmdm:nmah_703436", "hash": "2796b45cdb72ce06679a845eed6cc606cfa7460f", "docSignature": "9b1655304a1cf08b5b16460c73dd04e9", "timestamp": 1663782564, "lastTimeUpdated": 1653680846, "title": "Telegraph Sounder and Speaking Telephone"}