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.
LexaproRead more in this article about some frequently asked questions and fun facts related to our definitions.
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. 2019
Examples from the Web for 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
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
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