#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
  part:  #log_line
  part of:  #ship
  subtype:  #harpoon_log__harpoonlog  a cylindrical log with a device that registers distance
  subtype:  #patent_log__screw_log__screwlog__taffrail_log  a torpedo-shaped log with rotary fins that measure the ship's speed

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