Bunnell continuity-preserving cable relay key

Description
Telegraph repeaters 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, limiting the distance a message could travel. Repeaters remedied that problem by detecting a weak signal and using a local power source to re-energize and re-transmit the signal down the line.
Location
Currently not on view
maker
J. H. Bunnell & Co.
Measurements
overall: 4 in x 7 3/4 in x 4 1/2 in; 10.16 cm x 19.685 cm x 11.43 cm
ID Number
EM.181951
catalog number
181951
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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