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 self-contained, so-called "secret sounder" was used by Western Union's Switching Development Division as a field test unit.
Location
Currently not on view
user
Western Union Corporation
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
paper (overall material)
Measurements
overall: 4 1/4 in x 8 1/4 in x 9 3/8 in; 10.795 cm x 20.955 cm x 23.8125 cm
ID Number
EM.331949
serial number
19
collector/donor number
100-891
accession number
294351
catalog number
331949
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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