Telegraph Resonator

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. A resonator like this was used to amplify the sound, making it easier for an operator to hear his or her own sounder when working in a room filled with these devices.
Location
Currently not on view
Object Name
telegraph sounder
telegraph receiver
telegraph resonator
Physical Description
wood (overall material)
metal (overall material)
Measurements
overall: 5 1/4 in x 17 in x 4 1/2 in; 13.335 cm x 43.18 cm x 11.43 cm
ID Number
EM*332784
accession number
294351
catalog number
332784
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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