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 American Marconi, 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.
Location
Currently not on view
Object Name
sending key
telegraph key
maker
Marconi Wireless Telegraph Co. of America
Physical Description
metal (overall material)
wood (overall material)
plastic (overall material)
Measurements
overall: 3 3/8 in x 2 3/4 in x 9 in; 8.5725 cm x 6.985 cm x 22.86 cm
ID Number
EM*320852
catalog number
320852
accession number
241556
See more items in
Work and Industry: Electricity
Communications
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center

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