Farmer & Woodman telegraph repeater patent model
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"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": "1856"}], "identifier": [{"label": "ID Number", "content": "EM.251263"}, {"label": "catalog number", "content": "251263"}, {"label": "accession number", "content": "48865"}, {"label": "patent number", "content": "16828"}], "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 repeater was submitted with to the U.S. Patent Office by inventors Moses G. Farmer and Asa F. Woodman in 1856 for their \"Improvement in Telegraphic Repeaters.\" The basic idea of their patent was to prevent to action of the local telegraph circuit from interfering with the retransmission of a message between two distant stations. They received patent #16,828 on 17 March 1857 for this device."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "maker", "content": "Farmer, Moses G."}, {"label": "maker", "content": "Woodman, Asa F."}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Physical Description", "content": "cloth (overall material)"}, {"label": "Physical Description", "content": "steel (overall material)"}, {"label": "Measurements", "content": "overall: 4 in x 11 1/2 in x 11 in; 10.16 cm x 29.21 cm x 27.94 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "relay"}, {"label": "Object Name", "content": "telegraph relay"}, {"label": "Object Name", "content": "telegraph repeater"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_1096763", "hash": "43922700aeb44ef76435d8b7937dd15138846583", "docSignature": "d5cb2f3a34e23955d35be80e85533131", "timestamp": 1663781938, "lastTimeUpdated": 1653680506, "title": "Farmer & Woodman telegraph repeater patent model"}