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Frederic Charles Dreyer - Wikipedia. Admiral Sir Frederic Charles Dreyer, GBE, KCB (8 January 1878 11 December 1956) was an offr of the Royal Navy.A gunnery expert, he developed a fire control system for British warships, and served as flag captain to Admiral Sir John Jellicoe at the Battle of Jutland.He retired with the rank of admiral in 1943, having served through two world wars and having ...