Telegraph Sounder
name: label: maker
content: J. H. Bunnell & Co.
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 sounder has an unusual structure behind the armature yoke and we are uncertain of its purpose. The Western Union tag indicates this sounder was used in Havana, Cuba in the early twentieth century.
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.332187
label: accession number
content: 294351
label: catalog number
content: 332187
label: collector/donor number
content: 100-838
objectType: label: Object Name
content: telegraph receiver
label: Object Name
content: telegraph sounder
label: Other Terms
content: telegraph sounder; Measuring Devices
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: rubber (overall material)
label: Measurements
content: overall: 4 in x 8 1/2 in x 4 5/8 in; 10.16 cm x 21.59 cm x 11.7475 cm