Telegraph Sounder

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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 from Manhattan Electric Supply Company is rated at 150 Ohms resistance. That indicates the unit was intended for so-called "mainline" service over long distances.
Currently not on view
Manhattan Electric Supply Co.
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
overall: 3 1/2 in x 6 1/4 in x 3 1/2 in; 8.89 cm x 15.875 cm x 8.89 cm
ID Number
catalog number
accession number
collector/donor number
Credit Line
from Western Union Corporation
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Work and Industry: Electricity
Telegraph Sounders
Data Source
National Museum of American History