Ordinary seaman was the second-lowest rank of the 19th century
United States Navy, ranking above
landsman and below
seaman. Promotion from landsman to ordinary seaman required three years of experience or re-enlistment. An ordinary seaman who gained six years of experience and "knew the ropes", that is, knew the name and use of every line in the ship's
rigging, could be promoted to seaman. An ordinary seaman's duties aboard ship included "handling and splicing lines, and working aloft on the lower mast stages and yards." The rank existed from 1797 to 1917, when it was renamed "seaman second class". Seaman second class was later changed to the modern-day rank of
seaman apprentice. The related ranks of ordinary seaman second class and ordinary seaman, engineer's force, existed in 1876–1885 and 1871–1883, respectively. The term is still in use in the
United States Merchant Marine for entry-level deck personnel; the common abbreviation is OS. == Other countries ==