Semi-automatic Telegraph Key

Description (Brief)
Telegraph keys are electrical on-off switches used to send messages in Morse code. A semi-automatic telegraph key like this one allows an operator to send land-line and wireless telegraph messages at a much faster rate than with an ordinary key. The key automatically produces rapid morse code dots by using a weighted pendulum to quickly make and break contact in the electrical circuit. The operator still makes the dashes manually.
Currently not on view
Western Union Corporation
Physical Description
brass (overall material)
iron (overall material)
plastic (overall material)
overall: 2 3/4 in x 3 1/2 in x 7 1/2 in; 6.985 cm x 8.89 cm x 19.05 cm
ID Number
serial number
collector/donor number
accession number
catalog number
Credit Line
from Western Union Corporation
See more items in
Work and Industry: Electricity
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center


Hallo, this is a Bunnell Speed key, so called Bunnell Gold, second version. It have lost one terminal screw and plate with write "Bunnell gold bug". Here you will see complete Bunnel gold : All best de Claudio, HAM Call iz0krc.

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