#steamship__steamer  a ship powered by one or more steam engines
  supertype:  #ship  a vessel that carries passengers or freight
  subtype:  #paddle_steamer  #tramp_steamer
  part:  #steam_engine__steamengine  external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder
     part:  #steam_boiler__steamboiler__boiler  sealed vessel where water is converted to steam
        part:  #steam_whistle__steamwhistle  a whistle in which the sound is produced by steam; usually attached to a steam boiler
     part:  #crosshead  metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth
     part:  #steam_chest  the chamber from which steam is distributed to a cylinder

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