 The pole foremast was modified to a tripod after 1916 . This was due to the increased weight of masthead fire @-@ control equipment associated with director firing . In 1917 Lion and Princess Royal received searchlight towers on the after funnel and mainmast while losing 1 × 4 @-@ inch ( 102 mm ) gun each from the after battery . In early 1918 , both ships received flying @-@ off platforms on ' Q ' and ' X ' turrets , for Sopwith Pup and Sopwith 1 ½ Strutter aircraft . Lion was fitted with a torpedo control station at the aft end of her aft superstructure . 
