Telegraph Key
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"Communications"}], "date": [{"label": "date made", "content": "1873"}], "identifier": [{"label": "ID Number", "content": "EM.308872"}, {"label": "catalog number", "content": "308872"}, {"label": "accession number", "content": "89797"}, {"label": "patent number", "content": "142826"}], "notes": [{"label": "Description (Brief)", "content": "Telegraph keys are electrical on-off switches used to send messages in Morse code. The message travels as a series of electrical pulses through a wire. The sequence and duration of pulses represent letters and numbers. This patent model shows Martin Wessmann's design for an automatic key. His idea involved a key for each letter, number and character, somewhat like a piano keyboard. Each key included a circuit breaker controlled by gearing so that the pulses were generated at a regular speed. That prevented operators from blurring the message."}, {"label": "Location", "content": "Currently not on view"}], "name": [{"label": "maker", "content": "Wessmann, Martin F."}], "physicalDescription": [{"label": "Physical Description", "content": "wood (overall material)"}, {"label": "Physical Description", "content": "brass (overall material)"}, {"label": "Physical Description", "content": "gutta percha (overall material)"}, {"label": "Measurements", "content": "overall: 4 3/4 in x 3 1/4 in x 9 1/2 in; 12.065 cm x 8.255 cm x 24.13 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "telegraph key"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_706722", "hash": "f31b8f03bd525455726c7b32ee4816b21c92576f", "docSignature": "8544caabaec390f7561f3a358ebe4fca", "timestamp": 1663782597, "lastTimeUpdated": 1655973416, "title": "Telegraph Key"}