- 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.
- Currently not on view
- Object Name
- telegraph relay
- overall: 3 3/4 in x 8 1/4 in x 4 3/4 in; 9.525 cm x 20.955 cm x 12.065 cm
- ID Number
- catalog number
- accession number
- collector/donor number
- Credit Line
- from Western Union Corporation
- Data Source
- National Museum of American History
Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.