American Vibroplex Telegraph Key

Description (Brief)
Semi-automatic keys like this "American Vibroplex" automatically produced rapid morse code 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.
King & Company produced this key under license from a company that worked with Horace Martin, inventor of "Vibroplex" semi-automatic key.
Currently not on view
Object Name
telegraph key
sending key
wireless key
King & Company
Physical Description
steel (overall material)
plastic (overall material)
cloth (overall material)
rubber (overall material)
copper (overall material)
overall: 3 1/4 in x 3 1/2 in x 8 1/2 in; 8.255 cm x 8.89 cm x 21.59 cm
location of prior holder
United States: California, Los Angeles
ID Number
accession number
catalog number
serial number
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 Mr. and Mrs. Dan Hobaugh

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