Telegraph Sounder

Description (Brief)
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 is rated with a resistance of 4 ohms. Low resistance sounders were typically used on so-called "local lines" up to a few miles in length.
Location
Currently not on view
Object Name
telegraph receiver
telegraph sounder
maker
Western Electric
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 4 1/4 in x 5 1/4 in x 3 1/4 in; 10.795 cm x 13.335 cm x 8.255 cm
ID Number
EM*332353
accession number
294351
catalog number
332353
See more items in
Work and Industry: Electricity
Communications
Telegraph Sounders
Data Source
National Museum of American History, Kenneth E. Behring Center

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