A lake in the grounds of Cragside House in Northumberland, England. Cragside was the first house in the UK to be powered by Hydroelectricity. Lord Armstong was a prominent engineer and businessman who designed the system himself. The house was also one of the first anywhere to have electric light, using the bulb designed by Joseph Swan, who invented the lightbulb in the UK 1 year before Thomas Edison. Edison obtained patents in America for a direct copy of the Swan light, and started an advertising campaign which claimed that he was the real inventor. Swan was less interested in making money from the invention, agreed that Edison could sell the lights in America while he retained the rights in Britain, eventually they agreed to go into business together with the Edison & Swan United Electric Light Company (Also known as Ediswan). Well worth a visit.