Telegraph Key
date: label: date made
content: ca 1890
name: label: maker
content: Spies Electric Works
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 operator pushes the key’s lever down briefly to make a short signal, a dot, or holds the lever down for a moment to make a slightly longer signal, a dash. The sequence of dots and dashes represent letters and numbers. This key has a switch on the side to select which side of a battery to connect to a line, the positive or negative terminal, and is called a pole-changing 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 Western Union Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.331428
label: maker number
content: 1-B
label: collector/donor number
content: 100-825
label: accession number
content: 294351
label: catalog number
content: 331428
objectType: label: Object Name
content: key
label: Object Name
content: polechanger key
label: Object Name
content: telegraph key
physicalDescription: label: Physical Description
content: brass (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 2 in x 3 1/2 in x 6 in; 5.08 cm x 8.89 cm x 15.24 cm