 The main guns of the Lion @-@ class ships were controlled from the conning tower . Data from a 9 @-@ foot ( 2 @.@ 7 m ) Argo rangefinder located on top of the conning tower was input into a Mk I Dreyer Fire Control Table located in the transmitting station ( TS ) below the conning tower where it was converted into range and deflection data for use by the guns . The target 's data was also graphically recorded on a plotting table to assist the gunnery officer in predicting the movement of the target . ' B ' and ' X ' turrets were provided with nine @-@ foot rangefinders and were fitted as secondary control positions . 
