Patent model for Edison speaking telegraph, US Patent #203015
date: label: Date made
content: 1878
name: label: maker
content: Edison, Thomas Alva
notes: label: Description (Brief)
content: A model to accompany the application for US Patent #203015, "Speaking Telegraph," issued 30 April 1878 to Thomas A. Edison. A wooden base supporting a piece of heavy iron tubing, mounted horizontally and carrying a mica diaphragm to which is attached a steel spring that contacts a point on an adjustable shaft.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.252620
label: catalog number
content: 252620
label: accession number
content: 49064
label: patent number
content: 203015
objectType: label: Object Name
content: Telephone
label: Object Name
content: experimental telephone
label: Other Terms
content: Telephone; Telephones
physicalDescription: label: Measurements
content: overall: 3 1/4 in x 3 in x 5 in; 8.255 cm x 7.62 cm x 12.7 cm