polarized current reverser for telegraphy

polarized current reverser for telegraphy

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Description
Telegraph relays amplified electrical signals in a telegraph line. Telegraph messages traveled as a series of electrical pulses through a wire from a transmitter to a receiver. Short pulses made a dot, slightly longer pulses a dash. The pulses faded in strength as they traveled through the wire, to the point where the incoming signal was too weak to directly operate a receiving sounder or register. A relay detected a weak signal and used a battery to strengthen the signal so that the receiver would operate.
Location
Currently not on view
Object Name
polarized relay
telegraph relay
maker
Farmer, Moses G.
Measurements
overall: 6 in x 4 3/4 in x 9 in; 15.24 cm x 12.065 cm x 22.86 cm
ID Number
EM.181959
catalog number
181959
accession number
2015.0173
Credit Line
from Sarah J. Farmer
See more items in
Work and Industry: Electricity
Communications
Data Source
National Museum of American History
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