a bar of soft iron, mounted vertically beneath a compass to compensate for vertical magnetic currents.
Origin of Flinders bar
First recorded in 1880–85; named after M. Flinders
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
nautical a bar of soft iron mounted on a binnacle to compensate for local magnetism causing error to the compass
Word Origin for Flinders bar
C19: named after Matthew Flinders (died 1814), English navigator
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