 Fire @-@ control technology advanced quickly during the years immediately preceding World War I and the development of the director firing system was a major advance . This consisted of a fire @-@ control director mounted high in the ship which electrically provided gun data to the turrets via pointers , which the turret crewmen only had to follow . The director officer fired the guns simultaneously which aided in spotting the shell splashes and minimized the effects of the roll on the dispersion of the shells . Lion received her system in early 1915 while undergoing repairs after the Battle of Dogger Bank and Princess Royal got hers in early 1916 . A second director was added to each ship in 1918 . 
