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 so-called "Secret Sounder" is actually a portable telegraph unit made to resemble a pocket watch.
Currently not on view
Manufacturers' and Inventors' Electric Co.
Physical Description
metal (overall material)
cloth (overall material)
overall: 2 1/4 in x 1 1/4 in x 1/4 in; 5.715 cm x 3.175 cm x .635 cm
ID Number
collector/donor number
accession number
catalog number
Credit Line
from Western Union Corporation
See more items in
Work and Industry: Electricity
Telegraph Sounders
Data Source
National Museum of American History, Kenneth E. Behring Center


Add a comment about this object