turret is given an identification. In the British Royal Navy, these would be letters: "A" and "B" were for the turrets from the front of the ship backwards in front of the bridge, and letters near the end of the alphabet (i.e., "X", "Y", etc.) were for turrets behind the bridge ship, "Y" being the rearmost. Mountings in the middle of the ship would be "P", "Q", "R", etc. Confusingly, the s had a "Q" and the s had an "X" turret in what would logically be "C" position; the latter being mounted at the main deck level in front of the bridge and behind the "B" turret, thus having restricted training fore and aft. Secondary turrets were named "P" and "S" (port and starboard) and numbered from fore to aft, e.g. P1 being the forward port turret. There were exceptions; the battleship HMS Agincourt had the uniquely large number of seven turrets. These were numbered "1" to "7" but were unofficially nicknamed "Sunday", Monday", etc. through to "Saturday". In German use, turrets were generally named "A", "B", "C", "D", "E", going from bow to stern. Usually the radio alphabet was used on naming the turrets (e.g. "Anton", "Bruno" or "Berta", "Caesar", "Dora") as on the German battleship Bismarck. In the United States Navy, main battery turrets are numbered fore to aft. Secondary gun mounts are numbered by gun muzzle diameter in inches followed by a second digit indicating the position of the mount, with the second digit increasing fore to aft. Gun mounts not on the centerline would be assigned odd numbers on the port side and even numbers on the starboard side. For example, "Mount 52" would be the forwardmost 5-inch gun mount on the starboard side of the ship. Aircraft History During World War I, air gunners initially operated guns that were mounted on pedestals or swivel mounts known as pintles. The latter evolved into the Scarff ring, a rotating ring mount which allowed the gun to be turned to any direction with the gunner remaining directly behind it, the weapon held in an intermediate elevation by bungee cord, a simple and effective mounting for single weapons such as the Lewis Gun though less handy when twin mounted as with the British Bristol F.2 Fighter and German "CL"-class two-seaters such as the Halberstadt and Hannover-designed series of compact two-seat combat aircraft. In a failed 1916 experiment, a