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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The sweet of love had telegraph keys installed in the seance tables.
Next came the Morse section, with 25 or 30 stations, each of them equipped with telegraph keys, sounders, typewriters and chairs.
For example, he can create copperwire, batteries, and telegraph keys from basic components in the ground and can assemble them into a working long-range communications network It is interesting to note that the time when Mark Twain was writing was lust about the last period in which this story could make technical sense, because it was about the last time one individual could handle the whole process from raw materials to sophisticated modem stuff.