Telegraph Sounder
date: label: date made
content: ca 1905
name: label: maker
content: Manhattan Electric Supply 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. Instruments of this type were donated by the manufacturer tor use in the American Telegrapher's Tournament Association Contest held at Philadelphia on October 30 and 31, 1903. The price in 1905 for this sounder with an aluminum lever was $2.25, today that would be about $58.00.
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 Manhattan Electric Supply Co.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.222130
label: accession number
content: 41948
label: catalog number
content: 222130
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: aluminum (overall material)
label: Measurements
content: overall: 4 3/4 in x 4 in x 6 1/2 in; 12.065 cm x 10.16 cm x 16.51 cm