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 is one of the few units in the collection not made in America, having been made by the Automatic Telephone Manufacturing Company of Liverpool, England.
Location
Currently not on view
Object Name
telegraph receiver
telegraph sounder
maker
Automatic Telephone Manufacturing Co.
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
Measurements
overall: 4 3/4 in x 3 3/8 in x 5 1/4 in; 12.065 cm x 8.5725 cm x 13.335 cm
ID Number
EM*332355
accession number
294351
catalog number
332355
collector/donor number
06-30
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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