telegraph key

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Noun1.telegraph key - key consisting of a lever that sends a telegraph signal when it is depressed and the circuit is closedtelegraph key - key consisting of a lever that sends a telegraph signal when it is depressed and the circuit is closed
key - a lever (as in a keyboard) that actuates a mechanism when depressed
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One day in the late 1850s, the sun sent out an EMP so powerful it set telegraph keys on fire.
We were provided with a few items such as telegraph keys, aircraft recognition cards and, of course, given some drill.
The sweet of love had telegraph keys installed in the seance tables.