RMS Mauretania (1906) launched by the Duchess of Roxburghe. At the time of her launch, she was the largest moving structure ever built, and slightly larger in gross tonnage than "Lusitania". The main visual differences between "Mauretania" and "Lusitania" were that "Mauretania" was five feet longer and had different vents. "Mauretania" also had two extra stages of turbine blades in her forward turbines, making her slightly faster than "Lusitania". "Mauretania" and "Lusitania" were the only ships with direct-drive steam turbines to hold the Blue Riband; in later ships, reduction-geared turbines were mainly used. "Mauretania"s usage of the steam turbine was the largest application
Ship of the line so that by about 1750, with a few notable exceptions, they were of little use in naval battles. King Erik XIV of Sweden initiated construction of the ship "Mars" in 1563; this might have been the first attempt of this battle tactic, roughly 50 years ahead of widespread adoption of the line of battle strategy. "Mars" was likely the largest ship in the world at the time of her build, equipped with 107 guns at a full length of 96 meters. Ironically it became the first ship to be sunk by gunfire from other ships in a naval battle .