Bunnell continuity-preserving cable relay key
name: label: maker
content: J. H. Bunnell & Co.
notes: label: Description
content: 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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
label: See more items in
content: Communications
creditLine: label: Credit Line
content: from Sarah J. Farmer
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.181951
label: catalog number
content: 181951
label: accession number
content: 2015.0173
objectType: label: Object Name
content: telegraph key
label: Object Name
content: telegraph relay
label: Object Name
content: telegraph repeater
physicalDescription: label: Measurements
content: overall: 4 in x 7 3/4 in x 4 1/2 in; 10.16 cm x 19.685 cm x 11.43 cm