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Catalog Data

Maker:
Western Union Corporation  Search this
Maker:
Creed & Co., Ltd.  Search this
Physical Description:
metal (overall material)
Measurements:
overall: 5 1/4 in x 5 3/4 in x 4 1/4 in; 13.335 cm x 14.605 cm x 10.795 cm
Object Name:
relay
polar relay
telegraph relay
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
Credit Line:
from Western Union Corporation
ID Number:
EM.331941
Patent number:
172 717 / 235300
Collector/donor number:
100-889
Accession number:
294351
Catalog number:
331941
See more items in:
Work and Industry: Electricity
Communications
Data Source:
National Museum of American History
GUID:
http://n2t.net/ark:/65665/ng49ca746a7-1aac-704b-e053-15f76fa0b4fa
EDAN-URL:
edanmdm:nmah_891102