The Cooke and Wheatstone telegraph was an early electrical telegraph system invented by English inventors William Fothergill Cooke and Charles Wheatstone. The receiver consisted of a number of needles which could be moved by electromagnetic coils to point to letters on a board. This feature was liked by early users who were unwilling to learn codes, and employers who did not want to invest in staff training. The two-needle telegraph required three wires, one for each needle and a common return.


Cooke and Wheatstone Two Needle Telegraph, 1830s


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