Flame-proof Telegraph Key

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 L. S. Brach Company, 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
telegraph key
Other Terms
telegraph key; Radio
date made
1918
maker
L. S. Brach Manufacturing Co.
Physical Description
black (base color)
bakelite (overall material)
metal (overall material)
rubber (overall material)
Measurements
overall: 2 1/2 in x 3 3/4 in x 7 1/2 in; 6.35 cm x 9.525 cm x 19.05 cm
ID Number
EM.313585
catalog number
313585
accession number
188571
collector/donor number
R-2505
Credit Line
from the United States Bureau of Standards, Dept. of Commerce
See more items in
Work and Industry: Electricity
Communications
Telegraph Keys
Data Source
National Museum of American History
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