Cooke-Wheatstone telegraph. 19th-century diagrams showing several variations of the electric telegraph patented in 1837 by British inventors William Fothergill Cooke and Charles Wheatstone. This simple telegraph was installed on early railway lines. At lower right is the Davy telegraph (1838) by British inventor Edward Davy. Diagram from 'Traite de telegraphie electrique' (1849) by French Catholic priest and physicist Francois Napoleon Marie Moigno (1804-1884).

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