Clark telegraph repeater patent model
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"NMAH", "title_sort": "CLARK TELEGRAPH REPEATER PATENT MODEL", "guid": "http://n2t.net/ark:/65665/ng49ca746a5-3e82-704b-e053-15f76fa0b4fa", "title": {"label": "Title", "content": "Clark telegraph repeater patent model"}, "metadata_usage": {"access": "CC0"}, "data_source": "National Museum of American History"}, "indexedStructured": {"date": ["1860s"], "object_type": ["Patents", "telegraph repeater", "telegraph relay", "Models", "repeater"], "name": ["Clark, James J."], "topic": ["Telegraph Relays & Repeaters", "Communications"], "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 Relays & Repeaters"}], "date": [{"label": "date made", "content": "1860"}], "identifier": [{"label": "ID Number", "content": "EM.251254"}, {"label": "catalog number", "content": "251254"}, {"label": "accession number", "content": "48865"}, {"label": "patent number", "content": "29247"}], "notes": [{"label": "Description", "content": "Telegraph repeaters amplified electrical signals in a telegraph line. Telegraph messages traveled as a series of electrical pulses through a wire from a transmitter to a receiver. Short pulses made a dot, slightly longer pulses a dash. The pulses faded in strength as they traveled through the wire, limiting the distance a message could travel. Repeaters remedied that problem by detecting a weak signal and using a local power source to re-energize and re-transmit the signal down the line."}, {"label": "Description", "content": "This non-operating model was submitted to the U.S. Patent Office by inventor James J. Clark of Philadelphia. In July 1860, Clark received patent #29247 for his \"Improvement in Telegraphic Repeaters.\" Clark added an extra magnet to the local circuit of the repeater. Charles Davis and Frank Rae described Clark's repeater in 1877, noting that by then it was obsolete. \"The relays have [longer armature levers that respond to extra magnets but] the sounders do the repeating. ... It was very good and was extensively used at one time.\""}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "maker", "content": "Clark, James J."}], "physicalDescription": [{"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "cloth (overall material)"}, {"label": "Physical Description", "content": "ivory (overall material)"}, {"label": "Physical Description", "content": "steel (overall material)"}, {"label": "Physical Description", "content": "copper (overall material)"}, {"label": "Measurements", "content": "overall: 4 in x 12 1/4 in x 12 in; 10.16 cm x 31.115 cm x 30.48 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "repeater"}, {"label": "Object Name", "content": "telegraph repeater"}, {"label": "Object Name", "content": "telegraph relay"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_706633", "hash": "ae2c37338572193c8be5caac74ceb56447eec595", "docSignature": "c6827e887347fe8c47761ccc9b8dfe02", "timestamp": 1663782597, "lastTimeUpdated": 1653680847, "title": "Clark telegraph repeater patent model"}