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Admiralty Fire Control Table
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 and in the early 1920s,〔Naval Weapons of WW2, Campbell, p12〕 while battleships , , and , and the battlecruiser , received Mk VII tables in the late 1930s.〔Naval Weapons of WW2, Campbell〕 Battleships of the ''King George V'' class received a Mk IX table, while 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 men.〔The Naval Review,''Early Development of Naval Fire Control'', Dreyer, July 1986, page 241.〕
The Admiralty Fire Control Clock (AFCC) was a simplified version of the AFCT and was used for the local control of main armament and primary control of secondary armament of battleships and cruisers, and the main armament of destroyers and other small vessels.〔Naval Weapons of WW2, Campbell, p15〕 Some smaller cruisers also used the AFCC for main armament control.〔 The chief difference between the AFCT and the AFCC was the provision of a paper plotter in the former, which could plot both own ship and target ship movement and record the mean point of impact of the salvoes fired.〔
The AFCT and AFCC were used for gunnery control against surface targets. The High Angle Control System and Fuze Keeping Clock were used for gunnery control against aircraft.
==Notes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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