Vibroplex Telegraph Key

Description (Brief)
Telegraph keys are electrical on-off switches used to send messages in Morse code. Horace G. Martin patented a practical semi-automatic telegraph key in 1903 and his company dominated the market for these devices. Keys like Martin's "Vibroplex" automatically produced rapid morse codes dots by using a weighted pendulum to quickly make and break contact in the electrical circuit. The operator would make the dashes manually but could send much faster than with an ordinary key.
Location
Currently not on view
Object Name
semi-automatic key
telegraph key
date made
ca 1907
maker
Martin, Horace G.
Physical Description
slate (overall material)
metal (overall material)
plastic (overall material)
Measurements
overall: 2 1/2 in x 3 1/2 in x 8 in; 6.35 cm x 8.89 cm x 20.32 cm
ID Number
EM*320853
catalog number
320853
accession number
241556
subject
Communications
Telegraph Keys
See more items in
Work and Industry: Electricity
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
from Franklin Wingard
Additional Media

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