#pulley-block__pulley__block  a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
  supertype:  simple_machine__machine  a device for overcoming resistance at one point by applying force at some other point
  part of:  block_and_tackle
  subtype:  bollock__bullock_block__bullockblock  a pulley-block at the head of a topmast
  subtype:  fairlead  a pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing
     subtype:  snatch_block  a pulley-block that can be opened to receive the bight of a rope
  subtype:  idle_pulley__idler_pulley__idlerpulley__idle_wheel  a pulley on a shaft that presses against a guide belt to guide or tighten it

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