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Bunnell type 10-A single current telegraph relay

Bunnell type 10-A single current telegraph relay

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Description
Telegraph relays amplify an electrical signal in a telegraph line. Telegraph messages travel as a series of electrical pulses through a wire from a transmitter to a receiver. The pulses fade in strength as they travel through the wire, limiting the distance a message can be sent. Relays remedy that problem by detecting a weak signal and automatically re-transmitting that signal down the line using a local power source.
Location
Currently not on view
Object Name
relay
single current relay
telegraph relay
Maker
Western Union Corporation
maker
J. H. Bunnell & Co.
Measurements
overall: 4 in x 5 1/4 in x 5 in; 10.16 cm x 13.335 cm x 12.7 cm
ID Number
EM.331705
model number
10-A
collector/donor number
04-32
accession number
294351
catalog number
331705
Credit Line
from Western Union Corporation
See more items in
Work and Industry: Electricity
Communications
Data Source
National Museum of American History
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