http://www.sciencemuseum.org.uk/wallaceandgromit
Science Museum curator John Liffen introduces Cooke and Wheatstone's double needle telegraph. This double-needle instrument was installed in London, at Paddington station on an experimental line laid in 1843. In 1845 it created much interest through having secured the capture of a murderer, John Tawell.
http://www.sciencemuseum.org.uk/wallaceandgromit
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