Telegraph Sounder and Speaking Telephone
Telegraph Sounder and Speaking Telephone
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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. Inventor Amos Dolbear, known for his early experiments in telephony, made this patent model of a combination device that worked both as a telegraph sounder and a telephone receiver.
- Location
- Currently not on view
- Object Name
- patent model
- telegraph receiver
- telephone
- telegraph sounder
- Object Type
- Patent Model
- Other Terms
- telegraph sounder; Telephones
- date made
- 1879
- maker
- Dolbear, Amos E.
- Physical Description
- wood (overall material)
- metal (overall material)
- rubber (overall material)
- cloth (overall material)
- Measurements
- overall: 4 1/4 in x 4 1/2 in x 4 1/4 in; 10.795 cm x 11.43 cm x 10.795 cm
- ID Number
- EM.252631
- catalog number
- 252631
- accession number
- 49064
- patent number
- 220205
- See more items in
- Work and Industry: Electricity
- Communications
- Telegraph Sounders
- Data Source
- National Museum of American History
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