Telegraph Sounder
name: label: user
content: Western Union Corporation
notes: label: Description (Brief)
content: Telegraph sounders convert electrical pulses into audible sounds and are used to receive Morse code messages. The message travels as a series of electrical pulses through a wire. Short pulses make a dot, slightly longer pulses make a dash. The sequence of dots and dashes represent letters and numbers. The pulses energize the sounder’s electromagnets which move a lever-arm. The arm makes a loud “click” when it strikes a crossbar and the operator translates the pattern of sounds into the original language. This self-contained, so-called "secret sounder" was used by Western Union's Switching Development Division as a field test unit.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
label: See more items in
content: Communications
label: See more items in
content: Telegraph Sounders
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.331949
label: serial number
content: 19
label: collector/donor number
content: 100-891
label: accession number
content: 294351
label: catalog number
content: 331949
objectType: label: Object Name
content: telegraph receiver
label: Object Name
content: telegraph sounder
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: rubber (overall material)
label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: 4 1/4 in x 8 1/4 in x 9 3/8 in; 10.795 cm x 20.955 cm x 23.8125 cm