#log.measuring_instrument  measuring instrument that consists of a float that trails from a ship by a knotted line in order to measure the ship's speed through the water
  supertype:  measuring_instrument__measuringinstrument__measuring_system__measuringsystem__measuring_device__measuringdevice  instrument that shows the extent or amount or quantity or degree of something
  subtype:  harpoon_log  patent_log
  part of:  ship
  part:  log_line__logline  a knotted cord that runs out from a reel to a piece of wood that is attached to it

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