#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
  part:  balance_wheel  dial  escapement  hairspring  hand  time-ball
  subtype:  atomic_clock  a timepiece that derives its time scale from the vibration of atoms or molecules
     subtype:  ammonia_clock__ammoniaclock  an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
     subtype:  caesium_clock__caesiumclock  an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field
  subtype:  clock  a timepiece that shows the time of day
     subtype:  alarm_clock__alarmclock__alarm  a clock that wakes sleeper at preset time
     subtype:  Big_Ben  clock in the clock tower of the Houses of Parliament, London
     subtype:  chronometer  an accurate clock (especially used in navigation)
     subtype:  cuckoo_clock  clock that announces the hours with a sound like the call of the cuckoo
     subtype:  electric_clock  a clock using a small electric motor
     subtype:  pendulum_clock  a clock regulated by a pendulum
        subtype:  grandfather_clock__grandfatherclock__longcase_clock  a pendulum clock enclosed in a tall narrow case
     subtype:  system_clock.clock__systemclock  a time-of-day clock in a computer system
     subtype:  time_clock  clock used to record the hours that people work
     subtype:  turret_clock  a clock with more than one dial to show the time in all directions from a tower
     subtype:  wall_clock  a clock mounted on a wall
     subtype:  water_clock__waterclock__clepsydra__water_glass__waterglas  clock that measures time by the escape of water
  subtype:  sandglass__sandglas  timepiece in which the passage of time is indicated by the flow of sand from one transparent container to another through a narrow passage
     subtype:  egg_timer__eggtimer  a sandglass that runs for three minutes; used to time the boiling of eggs
     subtype:  hourglass__hourglas  a sandglass that runs for sixty minutes
  subtype:  sundial  timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial
  subtype:  timer  a timepiece that measures a time interval and signals its end
     subtype:  chronograph  an accurate timer for recording time
     subtype:  parking_meter__parkingmeter  a coin-operated timer located next to a parking space; depositing money into it entitles you to park your car there for a specified length of time
     subtype:  stopwatch__stopo_watch__stopowatch  a timepiece that can be started or stopped for exact timing (as of a race)
  subtype:  ticker__watch  a small portable timepiece
     subtype:  analog_watch  a watch that represents time by the position of hands on a dial
     subtype:  digital_watch__digitalwatch  a watch with a digital display
     subtype:  hunting_watch__huntingwatch__hunter  a watch with a hinged metal lid to protect the crystal
     subtype:  pendulum_watch  (18th century) a watch with a balance wheel having a fake pendulum attached to it
     subtype:  pocket_watch  a watch that is carried in a small watch pocket
     subtype:  stem-winder  a watch that is wound by turning a knob at the stem
     subtype:  wristwatch__wrist_watch__wristwatch  a watch that is worn strapped to the wrist

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