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 double sounder was one part of a patent model demonstrating a two-circuit telegraph relay system.
Location
Currently not on view
date made
ca 1872
maker
L. G. Tillotson & Co.
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 3 1/2 in x 4 3/4 in x 6 3/4 in; 8.89 cm x 12.065 cm x 17.145 cm
ID Number
EM.251259
catalog number
251259
accession number
48865
patent number
223248
130426
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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