Patent model for Edison speaking telegraph carbon transmitter, US Patent #203014
date: label: Date made
content: 1878
name: label: associated person
content: Edison, Thomas Alva
label: maker
content: Edison, Thomas Alva
notes: label: Description (Brief)
content: A model to accompany the application for US Patent #203014, "Speaking Telegraph," issued 30 April 1878 to Thomas A. Edison. A wooden square base showing an arrangement of batteries, condensers, and coils, covered by a wooden box and a round frame carrying a diaphragm with 2 carbon contact springs on the outside. The hole in top is apparently intended for a mouthpiece. Some components are wooden mockups.
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.252618
label: catalog number
content: 252618
label: accession number
content: 49064
label: patent number
content: 203014
objectType: label: Object Name
content: Telegraph, Speaking
label: Object Name
content: telephone transmitter
label: Other Terms
content: Telegraph, Speaking; Telephones; Transmitter; Carbon
physicalDescription: label: Measurements
content: overall: 5 in x 11 in x 11 in; 12.7 cm x 27.94 cm x 27.94 cm