Olympic-class ocean liner of 29 coal-fired steam boilers in six compartments. However, "Olympic"s boilers were adapted for firing by oil at the end of the First World War, which reduced the number of engine crew required from 350 to 60. The "Olympic"-class ships were long, displacing normally (their draft at this displacement being ), and their tonnage was around 45-46,000 GRT. "Olympic" became the largest ship in the world when it was completed in May, 1911 before losing the title to its sister "Titanic" when she was completed in April, 1912. After the loss of "Titanic" the third sister ship "Britannic" claimed the
Medieval ships of construction. It could be either square rigged and lateen rigged ("Caravela Redonda") or only lateen rigged ("Caravela Latina"). The most famous examples of caravels were the "Niña" and the "Pinta". The carrack was a ship type invented in southern Europe in the 15th century and particularly developed in Portugal in the same century. It was a larger vessel than the caravel. Columbus’s ship, the Santa María was a famous example of a carrack. The ships commanded by Vasco da Gama as the São Gabriel, with six sails, a bowsprit, foresail, mizzen, spritsail and two topsails, already had the complete