Flame-proof Telegraph Key

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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 Connecticut Telephone & Electric, 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
date made
1918
associated date
1918
maker
Connecticut Telephone & Electric Company
Physical Description
brass (overall material)
copper (overall material)
steel (overall material)
bakelite (overall material)
Measurements
overall: 2 1/2 in x 2 7/8 in x 4 3/4 in; 6.35 cm x 7.3025 cm x 12.065 cm
ID Number
EM.321623
catalog number
321623
accession number
241556
Credit Line
from Franklin Wingard
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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