#crosshead  metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth
  supertype:  #block  a solid piece of something (usually having flat rectangular sides); "the pyramids were built with large stone blocks"
  part of:  #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 of:  #steamship__steamer  a ship powered by one or more steam engines
     part of:  #steam_locomotive__steamlocomotive  a locomotive powered by a steam engine

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