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needle telegraph

noun
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Definition of needle telegraph

: a telegraph signaling by the deflections of a magnetic needle (as when the receiver is a galvanometer with vertical needle)

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Learn More About needle telegraph

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Cite this Entry

“Needle telegraph.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/needle%20telegraph. Accessed 24 Jun. 2021.

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