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 sounder was made by the L. S. Brach Co., Newark, N.J., around the time of the First World War. The only Brach sounder in the collection, this unit has the electromagnets mounted horizontally instead of the more common vertical orientation. We do not know if this was simply a design feature or if the company believed the sounder worked better with the electromagnets in that configuration.
Location
Currently not on view
Object Name
telegraph receiver
telegraph sounder
date made
ca 1915
maker
L. S. Brach Manufacturing Co.
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 3 5/8 in x 2 3/4 in x 5 3/8 in; 9.2075 cm x 6.985 cm x 13.6525 cm
ID Number
EM*332359
collector/donor number
06-11
accession number
294351
catalog number
332359
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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