model selling at £395 (£ in 2014), a three-cylinder at £500 (£ in 2014), a four-cylinder at £650 (£ in 2014), a six-cylinder model priced at £890 (£ in 2014), All would be badged as Rolls-Royces and be sold exclusively by Rolls. The first Rolls-Royce car, the Rolls-Royce 10 hp, was unveiled at the Paris Salon in December 1904. Incorporation Rolls-Royce Limited was formed on 15 March 1906, by which time it was apparent that new premises were required for production of cars. After considering sites in Manchester, Coventry, Bradford and Leicester, it was an offer from Derby's council of cheap electricity that resulted in the decision to acquire a site on the southern edge of that city. The new factory was largely designed by Royce, and production began in early 1908, with a formal opening on 9 July 1908 by Sir John Montagu. The investment in the new company required further capital to be raised, and on 6 December 1906, £100,000 of new shares were offered to the public. In 1907, Rolls-Royce bought out C.S. Rolls & Co. The non-motor car interests of Royce Ltd. continued to operate separately. Rolls-Royce 40/50 During 1906 Royce had been developing an improved six-cylinder model with more power than the Rolls-Royce 30 hp. Initially designated the 40/50 hp, this was Rolls-Royce's first all-new model. In March 1908, Claude Johnson, Commercial Managing Director and sometimes described as the hyphen in Rolls-Royce, succeeded in persuading Royce and the other directors that Rolls-Royce should concentrate exclusively on the new model, and all the earlier models were duly discontinued. Johnson had an early example finished in silver and named, as if it were a yacht, Silver Ghost. Unofficially the press and public immediately picked up and used Silver Ghost for all the 40/50 cars made until the introduction of the 40/50 Phantom in 1925. The new 40/50 was responsible for Rolls-Royce's early reputation with over 6,000 built. Its chassis was used as a basis for the first British armoured car used in both world wars. Rolls-Royce Eagle aero-engine Aero-engine manufacturing began in 1914 at the government's request. The first model, the Rolls-Royce Eagle, entered production in 1915. Two Eagles powered Alcock and Brown's first non-stop trans-Atlantic crossing by aeroplane mounted on their converted Vickers Vimy bomber. Springfield USA In 1921, Rolls-Royce opened a new factory in Springfield, Massachusetts in the United States to help meet a three