 Sebastian Ziani de Ferranti established "Ferranti, Thompson and Ince" in 1882, to market his "Ferranti-Thompson Alternator", invented with the help of renowned physicist Lord Kelvin.His early alternators produced frequencies between 100 and 300 Hz.Ferranti went on to design the Deptford Power Station for the London Electric Supply Corporation in 1887 using an alternating current system.