Ships are principally distinguished as those called merchantmen, which belong to individuals or companies, and are engaged in commerce; and men-of-war, or the national ships, built for the purposes of war. The latter receive their designation from the number of their decks, or of the guns which they carry. The largest are termed ships of the line, from their forming the line of battle when acting together in fleets; and are divided into first-rates, second-rates, third-rates, &c. First-rates include all those carrying 100 guns and upwards, with a company of 850 men and upwards; second-rates mount 90 to 100 guns, and so on, down to the sixth-rates; but some ships of less than 44 guns are termed frigates.
