carried 20 Mark II*** torpedoes, each with a warhead of of TNT. They had two speed settings which governed their range; at , they could reach , or at . Fire control The main guns of Tiger were controlled from either of the two fire-control directors. The primary director was in the fore-top on the foremast and the other was mounted on the aft superstructure in the torpedo control tower. Data from rangefinders in the armoured hood above the conning tower and in 'B' and 'Q' turrets was transmitted to the Mk IV Dreyer Fire Control Table located in the transmitting station below the waterline. The observations were then plotted and converted into range and deflection data for use by the director and guns. A Mark VII* Dumaresq in the armoured tower was trained on the target to supply bearing data to one transmitting station for use in plotting and calculations, and a second station was fitted for the ship's secondary armament, although a pair of fire-control directors for those guns, one for each broadside, were not fitted until 1915. Fire-control technology advanced quickly during the years immediately preceding the First World War 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 elevation and training angles to the turrets via pointers, which the turret crewmen had only to follow. The director layer fired the guns simultaneously by an electrical trigger which aided in spotting the shell splashes and minimised the effects of the roll on the dispersion of the shells. During the war, Tigers rangefinders had increased in number and in size. By the end of the war, 'A' and 'Q' turrets mounted rangefinders while 'X' turret, the armoured hood above the conning tower (also known as the gun control tower), and the torpedo control tower had instruments. A rangefinder was fitted in the fore-top and three instruments were fitted on 'B' turret, the gun control tower and above the compass platform. A high-angle rangefinder was mounted above the roof of the fore-top for use by the anti-aircraft guns. Armour Tigers armour protection was similar to that of Queen Mary; her waterline belt of Krupp cemented armour measured thick amidships. It thinned to four inches towards the ship's ends, but did not reach either the bow or the stern. The depth of the