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Updated: August 21, 2026
I learned before I left the United States that Professor Wheatstone and Mr. Cooke, of London, had obtained letters patent in England for a 'Magnetic-Needle Telegraph, based, as the name implies, on the deflection of the magnetic needle. Their telegraph, at that time, required six conductors between the two points of intercommunication for a single instrument at each of the two termini.
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