oil that was sprayed on the coal to increase its burn rate. At full capacity, she could steam for at a speed of . Armament Lion mounted eight BL Mk V guns in four twin-gun turrets, designated 'A', 'B', 'Q' and 'X' from front to rear. Her secondary armament consisted of sixteen BL Mark VII guns, most of which were mounted in casemates. The two guns mounted above the forward group of casemates were given gun shields during 1913–1914 to better protect the gun crews from weather and enemy action. The starboard forward group of 4-inch guns was removed after April 1917. She was built without anti-aircraft (AA) guns, but a single quick-firing (QF) 6-pounder (57 mm) Hotchkiss gun on a high-angle mounting was fitted from October 1914 to July 1915. A single QF AA gun was added in January 1915, and another the following July. Two submerged torpedo tubes were fitted, one on each broadside; fourteen torpedoes were carried. Armour The armour protection given to the Lions was heavier than that of the Indefatigables; their waterline belt of Krupp armour measured thick amidships. It thinned to 4 inches towards the ships' ends, but did not reach either the bow or the stern. The upper armour belt had a maximum thickness of over the same length as the thickest part of the waterline armour and thinned to abreast the end turrets. The gun turrets and barbettes were protected by of armour, except for the turret roofs which used . The thickness of the nickel steel deck ranged from . Nickel steel torpedo bulkheads 2.5 inches thick were fitted abreast the magazines and shell rooms. After the Battle of Jutland revealed her vulnerability to plunging shellfire, of additional armour, weighing approximately , was added to the magazine crowns and turret roofs. Wartime modifications Lion received a fire-control director between mid-1915 and May 1916 that centralised the pointing and firing of the guns under the command of the director positioned on the foremast. The turret crewmen merely had to follow pointers controlled by the director to align their guns on the target. This greatly increased accuracy as it was easier to spot the fall of shells and eliminated the problem of the ship's roll dispersing the shells as each turret fired individually. By early 1918 Lion carried a Sopwith Pup and a Sopwith 1½ Strutter on flying-off platforms fitted on top of