Cooke and Wheatstone patent the electric telegraph

Background. William Fothergill Cooke, an English inventor, was inspired by experimental telegraphy in 1836. He constructed a three-needle system based on Schilling's principle. Charles Wheatstone, a physicist, lectured on similar systems in 1835. Cooke exhibited his telegraph in London in January 1837, leading to a partnership with Wheatstone that culminated in the May 1837 patent for signal transmission via electric circuits.

Patent and Design. The patent, filed in May 1837, covered improvements in signaling and alarms using electric currents. The system utilized needles on a board to point to alphabet letters. An experimental line was established between Euston and Camden Town in July 1837. The partnership deed was dated November 1837, formalizing the business arrangement where Cooke handled commercial aspects.

Early Demonstrations. The telegraph was successfully demonstrated on 25 July 1837. This event marked the transition from experimental apparatus to practical application. The system's commercial viability was proven through installations on railway lines, such as the Great Western Railway in 1838, which utilized the patented technology for operational signaling over thirteen miles.