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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
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for patent-log
Historical Examples
  • 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

(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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