Telegraph Call Box and 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 mounted on a board along with a call box from the Postal Telegraph Company. Call boxes placed in business offices allowed quick service for those who often sent telegrams. Activating the call box would alert Postal that one of their customers needed to send a telegram. Each box sent a specific number so the company could quickly dispatch a messenger to the correct address. The messenger retrieved the message and brought it back to the Postal office for transmission.
Location
Currently not on view
Object Name
telegraph receiver
call box
telegraph sounder
maker
J. H. Bunnell & Co.
Viaduct Company
Physical Description
wood (overall material)
brass (overall material)
rubber (overall material)
ceramic (overall material)
Measurements
overall: 4 in x 15 1/4 in x 12 in; 10.16 cm x 38.735 cm x 30.48 cm
sounder: 3 1/4 in x 5 1/2 in x 3 1/4 in; 8.255 cm x 13.97 cm x 8.255 cm
ID Number
EM*331356
collector/donor number
10-40
accession number
294351
catalog number
331356
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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