#pendulum  an apparatus consisting of an object mounted so that it swings freely under the influence of gravity
  supertype:  #apparatus.equipment__apparatu__setup  equipment designed to serve a specific function
  part:  #bob.weight
  subtype:  #Foucault_pendulum  pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation
  subtype:  #metronome  clicking pendulum indicates the exact tempo of a piece of music
  subtype:  #physical_pendulum__compound_pendulum  pendulum consisting of an actual object allowed to rotate freely around a horizontal axis
     subtype:  #ballistic_pendulum__ballisticpendulum  a physical pendulum consisting of a large mass suspended from a rod; its displacement is used to measure the velocity of a projectile
     subtype:  #clock_pendulum__clockpendulum  a physical pendulum used to regulate a clockwork mechanism
  subtype:  #simple_pendulum  a hypothetical pendulum suspended by a weightless frictionless thread of constant length

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