Semi-automatic Telegraph Key
name: label: maker
content: Electric Specialty Manufacturing Company
notes: label: Description (Brief)
content: Semi-automatic keys like this one automatically produced rapid morse code dots by using a weighted pendulum to quickly make and break contact in the electrical circuit. The operator would make the dashes manually but could send much faster than with an ordinary key.
label: Description (Brief)
content: Electric Specialty Manufacturing Company produced this key under license from a company that worked with Horace Martin, inventor of "Vibroplex" semi-automatic key.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
label: See more items in
content: Telegraph Keys
label: See more items in
content: Communications
creditLine: label: Credit Line
content: from Mr. and Mrs. Dan Hobaugh
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1985.0885.02
label: accession number
content: 1985.0885
label: catalog number
content: 1985.0885.02
objectType: label: Object Name
content: sending key
label: Object Name
content: telegraph key
physicalDescription: label: Physical Description
content: steel (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: cloth (overall material)
label: Physical Description
content: rubber (overall material)
label: Physical Description
content: copper (overall material)
label: Measurements
content: overall: 10 cm x 23 cm x 7.5 cm; 3 15/16 in x 9 1/16 in x 2 15/16 in