needle telegraph
noun1
A telegraph in which the signals are given by the deflections of a magnetic needle to the right or to the left of a certain position.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
noun
A telegraph in which the signals are given by the deflections of a magnetic needle to the right or to the left of a certain position.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.
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