#timepiece__timekeeper  a measuring instrument or device for keeping time
  supertype:  #measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  #atomic_clock  #clock  #sandglass  #sundial  #timer  #ticker
  part:  #balance_wheel__balancewheel  a wheel oscillating against the hairspring of a timepiece to regulate its beat
  part:  #dial  the face of a timepiece; graduated to show the hours
  part:  #escapement  mechanical device that regulates movement
     part:  #escape_wheel  gear that engages a rocking lever
  part:  #hairspring  a fine spiral spring that regulates the movement of the balance wheel in a timepiece
  part:  #hand  a rotating pointer on the face of a timepiece; "the big hand counts the minutes"
  part:  #time-ball  a ball that slides down a staff to show a fixed time; especially at an observatory

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