The Admiralty Fire Control Table (A.F.C.T.) was an electromechanical analogue computer fire-control system that calculated the correct elevation and deflection of the main armament of a Royal Navy cruiser or battleship, so that the shells fired would strike a surface target. The AFCT MK 1 was fitted to HMS Nelson and Rodney in the early 1920s, while the battleships Warspite, Valiant, and Queen Elizabeth, and the battlecruiser Renown, received Mk VII tables in the late 1930s. Battleships of the King George V class received a Mk IX table, while Vanguard received the final variant, the Mk X. The AFCT was the successor to the Dreyer tables, developed by Captain (later Admiral) Frederic Charles Dreyer, and the Argo Clock, developed by Arthur Pollen, and received developmental input from both me