Telegraph Sounder
date: label: date made
content: ca 1872
name: label: maker
content: L. G. Tillotson & 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 double sounder was one part of a patent model demonstrating a two-circuit telegraph relay system.
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
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.251259
label: catalog number
content: 251259
label: accession number
content: 48865
label: patent number
content: 223248
label: patent number
content: 130426
objectType: label: Object Name
content: telegraph receiver
label: Object Name
content: telegraph relay
label: Object Name
content: telegraph sounder
label: Object Type
content: Patent Model
label: Other Terms
content: telegraph sounder; Telegraphy
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: 3 1/2 in x 4 3/4 in x 6 3/4 in; 8.89 cm x 12.065 cm x 17.145 cm