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patent log

noun, Nautical.
any of various devices for determining the speed of a ship by means of a vaned rotor streamed at the end of a log line upon which it exerts a torsion transmitted to a registering device on board.
Also called screw log.
Origin of patent log
First recorded in 1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for patent log
Historical Examples
  • The man answered, and Jenkins departed with the boat's patent log.

    The Wreck of the Titan Morgan Robertson
  • See that the patent log and sounding machine are in good order.

    Lectures in Navigation Ernest Gallaudet Draper
  • The ocean was all right, and so was the patent log; as for speed, one saw it with his own eyes.

  • "Well, come and see me set the patent log," said Captain Whitby.

  • He went aft, and found the mate just heaving the patent log.

    Doctor Claudius, A True Story F. Marion Crawford
  • The patent log on the taffrail periodically rang a single tinkling stroke for every mile traversed on an errand of faith.

    Lord Jim Joseph Conrad
  • The average speed of the seven hours' steaming, as measured by patent log, was 19.28 knots.

  • Comparing the distance run by observation and by patent log, there was a difference of sixteen miles and a third.

    The Story of the Atlantic Telegraph

    Henry M. (Henry Martyn) Field
  • He was sailing by compass; the patent log, trailing behind on its long cord, maintained a constant, jerking register on its dial.

    Wild Oranges Joseph Hergesheimer
  • Other methods have been invented by various people, but Massey's patent log gives the most accurate measurement.

    The Sailor's Word-Book William Henry Smyth
British Dictionary definitions for patent log

patent log

(nautical) any of several mechanical devices for measuring the speed of a vessel and the distance travelled, consisting typically of a trailing rotor that registers its rotations on a meter Compare chip log
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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