Telegraph Sounder

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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, made by Western Electric, is rated at 50 ohms. Lower resistance units such as this tended to be used on local lines only a few miles in length.
Location
Currently not on view
maker
Western Electric
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 3 1/2 in x 5 1/2 in x 3 in; 8.89 cm x 13.97 cm x 7.62 cm
ID Number
EM.331763
accession number
294351
catalog number
331763
collector/donor number
100-015
Credit Line
from Western Union Corporation
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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