Telegraph Sounder Magnets

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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 is a patent model for an early form of sound amplifier. The patent covers the addition of a rod attached to the anvil on the electromagnet and connected to the ends of the wooden box. When the lever strikes the anvil, the vibration is also transmitted through the rod to the box boosting the sound.
Location
Currently not on view
date made
1865
maker
Clark, James J.
Splitdorf, Henry
Physical Description
wood (overall material)
metal (overall material)
cloth (overall material)
Measurements
overall: 4 1/4 in x 9 3/4 in x 5 1/2 in; 10.795 cm x 24.765 cm x 13.97 cm
ID Number
EM.308900
catalog number
308900
accession number
89797
patent number
49857
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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