Lindsey telegraph repeater patent model
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"unit_code": "NMAH", "title_sort": "LINDSEY TELEGRAPH REPEATER PATENT MODEL", "guid": "http://n2t.net/ark:/65665/ng49ca746ab-5f02-704b-e053-15f76fa0b4fa", "title": {"label": "Title", "content": "Lindsey telegraph repeater patent model"}, "metadata_usage": {"access": "CC0"}, "data_source": "National Museum of American History"}, "indexedStructured": {"date": ["1870s"], "object_type": ["Patents", "telegraph repeater", "telegraph relay", "Models", "repeater"], "name": ["Lindsey, Landy T.", "L. G. Tillotson & Co.", "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": "1873"}], "identifier": [{"label": "ID Number", "content": "EM.251264"}, {"label": "catalog number", "content": "251264"}, {"label": "patent number", "content": "136251"}, {"label": "accession number", "content": "48865"}], "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": "In July 1872, inventor Landy T. Lindsey of Tennessee submitted this model along with his application for a U.S. patent. In 1873 he received patent #136251 for an \"Improvement in Telegraph-Repeaters,\" in which he disclosed a circuit design \"simple, reliable and void of many of the mechanical auxiliaries heretofore used\" in automatic repeaters. He did not manufacture all the parts of his model however. The telegraph keys were made by L. G. Tillotson & Co., and the sounders and relays have the stamp of James J. Clark of Philadelphia. Lindsey simply arranged the manufactured components in a novel circuit to accomplish his invention."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "maker", "content": "Clark, James J."}, {"label": "maker", "content": "L. G. Tillotson & Co."}, {"label": "maker", "content": "Lindsey, Landy T."}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "metal (overall material)"}, {"label": "Measurements", "content": "overall: 5 in x 12 in x 9 3/4 in; 12.7 cm x 30.48 cm x 24.765 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "repeater"}, {"label": "Object Name", "content": "telegraph relay"}, {"label": "Object Name", "content": "telegraph repeater"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_706361", "hash": "a7af59b9282a5a9ca0e79996c9d5f10bc0fc2317", "docSignature": "91dd29da0c5150014cec1b25dce66296", "timestamp": 1663782597, "lastTimeUpdated": 1653680847, "title": "Lindsey telegraph repeater patent model"}