Semi-automatic Telegraph Key

Description (Brief)
Telegraph keys are electrical on-off switches used to send messages in Morse code. A semi-automatic key repeated the Morse code dots rapidly, much like holding down a key on a keyboard for repeated letters. The operator still keyed the dashes but could work much faster. The Mecograph Company created a right-angle semi-automatic telegraph key around 1906. They competed with Horace Martin's Vibroplex Company until Martin purchased Mecograph in 1914.
Currently not on view
Object Name
sending key
telegraph key
date made
ca 1908
associated date
Mecograph Company
Physical Description
metal (overall material)
plastic (overall material)
overall: 3 1/8 in x 4 1/4 in x 6 in; 7.9375 cm x 10.795 cm x 15.24 cm
ID Number
catalog number
accession number
See more items in
Work and Industry: Electricity
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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