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 features an unusual design. The two brass arms that serve as the sounder's anvil are both set to one side of the unit. This may have been to allow easier access to the adjusting screws if the unit was mounted in a partially-enclosed resonator.
Location
Currently not on view
maker
J. H. Bunnell & Co.
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 3 3/4 in x 3 in x 5 1/2 in; 9.525 cm x 7.62 cm x 13.97 cm
ID Number
EM*332358
collector/donor number
08-02
accession number
294351
catalog number
332358
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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