Patent model, Gray electro-harmonic telegraph, US Patent #173,618

Patent model, Gray electro-harmonic telegraph, US Patent #173,618

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Location
Currently not on view
Object Name
Harmonic telegraph
telegraph transmitter
Other Terms
Harmonic telegraph; Telegraphy
Date made
1876
date made
1875
associated person
Gray, Elisha
maker
Elisha Gray
Measurements
overall: 7 in x 12 in x 12 1/2 in; 17.78 cm x 30.48 cm x 31.75 cm
ID Number
EM.308867
catalog number
308867
accession number
89797
patent number
173618
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Work and Industry: Electricity
Data Source
National Museum of American History
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