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patent log

noun Nautical.
  1. 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.
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Origin of patent log

First recorded in 1875–80
Also called screw log.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for patent log

Historical Examples of patent log

  • He could find his way along the coast by compass and patent-log, but to steer an ocean course was another thing.

    Wyndham's Pal

    Harold Bindloss


British Dictionary definitions for patent log

patent log

noun
  1. 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 meterCompare chip log
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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