patent log

Other forms: patent logs

Definitions of patent log
  1. noun
    a cigar-shaped log with rotary fins that measure the ship's speed
    synonyms: screw log, taffrail log
    see moresee less
    type of:
    log
    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
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