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
Object Name
telegraph receiver
telegraph sounder
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
subject
Communications
Telegraph Sounders
See more items in
Work and Industry: Electricity
Telegraph Sounders
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
from Western Union Corporation

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