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Cooke and Wheatstone's most successful system was eventually a one-needle system that continued in service into the 1930s.

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The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone.

It was the first telegraph system to be put into commercial service.

Cooke's earlier ideas for a mechanical telegraph (involving a clockwork mechanism with an electromagnetic detent) were largely abandoned.

In January 1837 Cooke proposed a design for a 60-code telegraph to the directors of the Liverpool and Manchester Railway.

Their differences were taken to arbitration with Marc Isambard Brunel acting for Cooke and John Frederic Daniell acting for Wheatstone.

Cooke eventually bought out Wheatstone's interest in exchange for royalties.

The Blackwall Tunnel Railway (another rope-hauled application) was equipped with the Cooke and Wheatstone telegraph when it opened in 1840, and many others followed.

In September 1845 the financier John Lewis Ricardo and Cooke formed the Electric Telegraph Company.

Cooke and Wheatstone had their first commercial success with a telegraph installed on the Great Western Railway over the 13 miles (21 km) from Paddington station to West Drayton in 1838.

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