What was Joseph Henry's contribution to the Practical Electrical Telegraph?
His work on Electromagnetic relay was the basis
He built the first Telegraph
He funded its invention
Not sure
Answer
Joseph Henry's contribution to the Practical Electrical Telegraph was his work on Electromagnetic relay, which was the basis of the telegraph system. The relay was an electromagnet that could be activated by an electrical current, and it could be used to amplify a weak signal or to switch a circuit on or off.
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