资料来源 : Webster's Revised Unabridged Dictionary (1913)

   {Log glass} (Naut.), a small sandglass used to time the
      running out of the log line.

   {Log line} (Naut.), a line or cord about a hundred and fifty
      fathoms long, fastened to the log-chip. See Note under 2d
      {Log}, n., 2.

   {Log perch} (Zo["o]l.), an ethiostomoid fish, or darter
      ({Percina caprodes}); -- called also {hogfish} and
      {rockfish}.

   {Log reel} (Naut.), the reel on which the log line is wound.
      

   {Log slate}. (Naut.) See {Log board} (above).

   {Rough log} (Naut.), a first draught of a record of the
      cruise or voyage.

   {Smooth log} (Naut.), a clean copy of the rough log. In the
      case of naval vessels this copy is forwarded to the proper
      officer of the government.

   {To heave the log} (Naut.), to cast the log-chip into the
      water; also, the whole process of ascertaining a vessel's
      speed by the log.

资料来源 : WordNet®

log line
     n : a knotted cord that runs out from a reel to a piece of wood
         that is attached to it