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Creed polar relay

Creed polar 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
polar relay
relay
telegraph relay
maker
Creed & Co., Ltd.
Measurements
overall: 5 1/2 in x 5 3/4 in x 4 1/2 in; 13.97 cm x 14.605 cm x 11.43 cm
ID Number
EM.332136
patent number
172717
collector/donor number
100-883
serial number
1372
accession number
294351
catalog number
332136
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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