F.H. af Chapman (1721-1808) was a brilliant 18th-century shipbuilder working as a manager for the Swedish Karlskrona navy shipyard. He ended his study in England under Thomas Simpson with a tour around English, French and Dutch shipyards. There he draughted many ships on the stocks and in 1768 he published his Architectura Navalis Mercatoria, in which he presented his drawings, all accompanied by his calculations of draught, stability, center of gravity and more sort like scientific data.