Flame-proof Telegraph Key

Description (Brief)
Telegraph keys are electrical on-off switches used to send messages in Morse code and can spark when the circuit opens. Flame-proof telegraph keys, like this one made by General Radio, were designed to contain the spark within a sealed chamber. These keys were necessary on early aircraft and in confined spaces such as aboard ships and submarines where the spark might ignite flammable gasses.
Currently not on view
Object Name
wireless key
sending key
telegraph key
date made
ca 1918
General Radio Company
overall: 1 1/2 in x 2 3/4 in x 5 in; 3.81 cm x 6.985 cm x 12.7 cm
ID Number
accession number
catalog number
Telegraph Keys
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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